Exactly the same issue here: I use an 1.1.2 Iphone (IPSF unlocked). When I try to start the application I get a 
black screen for approximately 2 second (status bar on top still visible) then my iphone switches back to the 
main screen. My iphone runs on german language, but when I switch to English everything is the same.

Has anyone an idea how I can put away the program icon from the start screen? 

Which files do I have do delete?

I also get:  Main script execution failed! The icon is there but as a launch it the
screen goes black and then returns to springboard.

same to me: black screen with status bar, then back to springboard. But uninstall worked fine for me...
(1.1.2)

I'm having the exact same problem.  Won't launch, but I can uninstall via installer.app
1.1.1

The installation script extracts MP3 files into raw wavetable files. If you have an
SSH access to your iPhone, can you execute following script and post the output?

/bin/sh /Applications/PocketGuitar.app/extract_samples.sh

Also, if you want to remove your partially-installed PocketGuitar app, remove
following folders:

/Applications/PocketGuitar.app
/var/root/Media/PocketGuitar

I think it could fail if BSD subsystem isn't installed to your iPhone - if you have
installation failures, can you tell me if BSD subsystem is installed or not?

I have the BSD subsystem installed but had the same problem as above, installed the app and got the Main script 
execution failed msg. The App is there, but it won't sart.

I got this to work by reinstalling BSD subsystem and then reinstalling the pocket
guitar.app

Changing priority to Critical.

schokoladen, if you can login to your iPhone with SSH, can you try executing
following script?

/bin/sh /Applications/PocketGuitar.app/extract_samples.sh

FIXED:

I am not a member of this development group, but I have found a solution. This was
stated above, but I have confirmed that it works. If you have trouble installing:

1) Make sure you have the BSD Subsystem installed, and if you don't get it. BSD Lite
doesn't count.

2) Uninstall/Delete all current PocketGuitar files through either installer, iBrickr,
SSH, or a filesystem like Finder on the device.

3) Reinstall the BSD Subsystem. You can do this by entering Installer, going to
Uninstall, then pressing the BSD Subsystem package. You'll notice that the usual
"Uninstall" button has been replaced by a "Reinstall" one. Press it and voila,
reinstalled BSD Subystem. Remember to restart the device before continuing.

4) Go back to Installer and reinstall the PocketGuitar package. It should work.

You're done! Test this out, everyone, and devTeam, post this if it works after testing.

Installing the BSD-Subsystem fixed the Error. I just installed again and everything worked!

Nice application! Maybe you should add a feature to chose chords (like Nint**do DSs  "jam sessions").

Yeah, it worked! Thanks a lot! And great App! Thanks a lot!

I can't delete the folder /var/root/Media/PocketGuitar

I am trying to do it by ssh using fugu.  Any reason or another way I should do it?

With Fugu you can only erase empty folders. That means you have to erase all the date in the folders, and the 
folders inside the folders so you can erase that one. I had the same problem and googled it.

Cheers!

I'm on 1.1.2 and I am having similar problems.  Tried with the bsd subsystem after rebooting and got the 
same thing.  Tried running the script in pocketguitar and it complained about the lack of the folder where the 
samples are going.  I manually created the folder and tried the script again.  It went instantly to the next line 
in terminal and doesn't appear to have done anything.

Trying again.
1 removed the 2 pocketguitar items (sample folder didn't exist)
2 relaunched springboard, pocketguitar isn't there
3 reinstalled bsd subsystem again
4 rebooted phone
5 tried to install pocketguitar again
6 . . . not showing in springboard
7 rebooted springboard, pocketguitar showing
8 . . . nope.  Just hanging at a black screen.

Still have the same situation, PocketGuitar in Apps, but no folder for the samples.

I had the problem with the failed installation, turns out my iPhone did not have sed 
installed. Installing sed fixed the problem, and now everything works great.

Hi,

I have the same problem. I deleted all the pocketguitar files but the app doesn't 
appear in the installer.

Perhaps, try chmoding the executable, +x?

It will be fixed in 0.2 - it won't require BSD subsystem any longer.

I'm on 1.1.2 Jailbreak (English) and I've tried all of the above...and nothing 
works...Even after deleting Pocket Guitar, reinstalling BSD, restarting iphone and 
reinstalling Pocket Guitar....now the pocket guitar icon won't come up...  :(    
After so many hours of screwing around without success, I give up and yield...

I = Very unhappy...

Does it matter that installer is sing BSD 1.5 and not 2.0??

Developers - Can't wait for a trouble-free, plug and play version to come out...

  

Hang on...GET THIS...BEFORE FOLLOWING THE ABOVE STEPS READ THIS!

After following the above procedures now NO MORE NEWLY ADDED APPS CAN BE ADDED...

F***ING FANTASTIC!  

Gotta love them apps....

Very unhappy has now risen to now extremely unhappy...further unhappiness shall lead 
to 'Going Postal.'

i have a regular iphone but i dont know where to get the pocket guitar app where do 
u get it and where is installet

0.2 doesn't rely on BSD subsystem any more, so it should have been fixed now.

I have the same problem. after installing BSD subsystem and pocket guitar, i can't
install any new apps. the main script execution error comes up when i try to install
any app. anyone know how to solve this?

yeah i'm still getting this installation error...i've tried all of the above
solutions...and i have a 1.1.1 jail borken ipod touch...

Still getting that error. I've tried it since yesterday and it doesn't work. I don't
even get the icon on the Springboard.. and im on 1.1.1 jailbroken itouch

i installed the new bsd subsytem and my iphone is frozen , , wont work , nothing , it
is a 112 unlocked with gehotz and now it's locked up , it said when it was
downloading it something about passwrd not working and will make springboard not work
and to use password but how do i change this password were do i go , and the release
or update was at 1245am gmt-5 eastern canada toronto thank you for all your help 

i have now 0.2 verison  but problem come , i installed it yesterday it worked fine
but today suddenly the sound is gone that yellow box on the acords  thats gone now
and my guitar dosnt do any sound , 

i have 1.1.3 jailbroken 

any advice _ 

mmm... worked fine on my Ipod touch 1.1.1 firmware.. but after fiddling with it for a
while the sound seemed to stop working... Any idea how to fix this?

I had this issue.  I don't remember the order I installed the BSD sub system.  Some 
how /private/var/root/Media was not a directory but an actual file.  After deleting 
this, I was able to install this app.

Mine works fine apart from i get no sound everything seems to be installed correctly
there is .mp3 files + .raw files in the media/pocketguitar/***** folders but i dont
get any sound when i hit a fret.

johnconn1985 Do you see it in uninstall ?

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Anyone figured this out I have tried everything!

I have the same problem I installed it, play a few accords and then silence...
i can,t hear anything...i unistalled and installed again several times but it doesnt 
works....help!!!!

Was there a fix for the app showing but not opening? When launched it goes black like
mentioned above and quits.. Im running 1.1.4 with all sources

I need a fix for this..looks so awsome!! I get black screen like others here, and I
can  install and run other programs. Im running 1.1.4 and ziphone 2.5c

same here. re-install BSD and Pocket Guitar...still not working.. Please help!!

help!!! same as the guy above.  Can't run the app.  I get a black screen.  Im running
1.1.4. and ziphone 2.5c

I followed one of the comments and run the extract_samples. Got below error
/Applications/PocketGuitar.app$ /bin/sh extract_samples.sh
/bin/sh: can't open input file: extract_samples.sh
/Applications/PocketGuitar.app$ /bin/sh extract_samples
extract_samples:1: command not found: \M-N\M-z\M-m\M-~^L
extract_samples:1: command not found: ^H
extract_samples:1: permission denied: 
extract_samples:1: command too long: \M-u\M-
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^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@\M-^]\M-d^D^P\M-^M\M-b^A@\M-^@\M-b^D!\M-^A\M-
`^G\M-P\M-M\M-c
extract_samples:2: permission denied: 
extract_samples:2: permission denied: 
extract_samples:3: no such file or directory: \M-40\M-^_\M-e
extract_samples:4: no such file or directory: \M-^T0\M-^_\M-e
extract_samples:5: command not found: ^D
extract_samples:6: no such file or directory: \M-^?/\M-a^@^@P\M-c^C^@^@
extract_samples:7: no such file or directory: 
extract_samples:1: permission denied: 
extract_samples:8: permission denied: 
extract_samples:1: permission denied: 
extract_samples:2: no such file or directory: ^@^@
extract_samples:3: command not found: \M-=^^\M- \M-c^A^Y\M-^A\M-c^A^P\M-^T\M-g
extract_samples:4: permission denied: /
extract_samples:8: command not found: 0\M-^_\M-e^T
extract_samples:1: command not found: \M- \M-a^B
extract_samples:2: unmatched "
extract_samples:194: parse error in command substitution
extract_samples:196: no such file or directory: \M- \M-c^C0\M-^V\M-g\M-;/\M- \M-c+\M-
^B\M-c^B \M-^V\M-g^C^@R\M-a\M-K^@^@:\M-:?\M- \M-c
extract_samples:196: command not found: \M-^C\M-c
extract_samples:199: command not found: \M-^C\M-c^C@\M-^F\M-g\M-JO\M- \M-cK\M-^D\M-
c^D \M-^V\M-g\M-IO\M- \M-cK\M-^D\M-c^F\M- \M- \M-a^D^P\M-:\M-g^B@\M-^A\M-a
extract_samples:200: command not found: \M-1N\M- \M-c^BI\M-^D\M-c^D@\M-^V\M-g^D0\M-
^X\M-e^D@#\M-`\M-C?\M- \M-c;\M-^C\M-c^C0\M-^V\M-g
extract_samples:200: permission denied: 
extract_samples:200: command not found: \M-^C\M-c^C0\M-^V\M-g
extract_samples:201: command not found: \M-9O\M- \M-cK\M-^D\M-c^D^P\M-^F\M-g
extract_samples:1: command not found: B^A
extract_samples:2: no such file or directory: ^S/o\M-a^Q^Oo\M-a^B
extract_samples:2: command not found: C
extract_samples:2: command not found: C
extract_samples:3: command not found: S\M-a
extract_samples:4: command not found: S\M-a
extract_samples:1: no such file or directory: B^^\M-^?/\M-a
extract_samples:204: command not found: \M- \M-^V\M-g^D@\M-\n\M-a^X
extract_samples:216: command not found: S^S
extract_samples:216: permission denied: 
extract_samples:8: unmatched "
extract_samples:218: parse error in command substitution
extract_samples:307: parse error near `\M-^B\M-c^B'

Here Is the fix: http://www.modmyifone.com/forums/showthread.php?t=26283&page=7
Thanks to "Gambit_Rah" :)

Woah, that works :)
Thank you very much <3

I think The only problem is the Pocketguitar app can't create a folder 
in "/private/var/root/Media/PocketGuitar" because the MEDIA folder is protected. i 
try to change the attribute for MEDIA folder but it keeps coming back to original 
permission.

anyone know how to remove the Folder permission in "private/var/root/Media/"?
cause basically you cant make any folder inside of MEDIA folder. NO WRITE PERMISSION 
for EVERYONE and GROUP only the OWNER has. the POCKETGUITAR should be installed 
in "private/var/root/Media/PocketGuitar" and i cant move files and folder there. =(

HELP PLS!

when i try to reinstall BSD SUBSYSTEM i get a package downoad ERROR. im on 1.1.2. can
someone help me please.

Hello Everybody,

I have found the solution by myself, just by tryin it out how it possibly works, you
don't have to f*ck with the bsd-subsystem or something else. I am running 1.1.2 , For
iphone-users who has trouble with the problem 'Can't find the host' when you want to
install it her is the solution:

step 1. First of all you have to have installed the source: ModMyiFone -
http://modmyifone.com/installer.xml ( you can find lots of information in google how
to add a repository in the installer)

Step 2.
Now you can find the app '' pocket guitar'' in installer in the category 'toys'.

Step 3. 
Go again to installer and add the following url in 'source':
http://repo.smxy.org/iphone-apps/
after installing this you have to go to installer and 
--> go to 'toys' and then to 'pocket guitar' (after step 1. you have to see 'pocket
guitar' in the list, then click on 'install'.

Step4. 
Now you first will see a lot choices --> 
'install'
'add to Queue' or 'remove from Queue'
'clear list'
'cancel'

you must before installing remove all pocket guitar data you have installed before,
so click on 'remove from queue' and 'clear list' if you see these two choices.
the list must be clear and FINALLY you can install the 'pocket guitar', I did it so
you must also be ablo to do that! and it WORKS!!!

I hope that i have helped you guys with this, 
have a nice iphone time.

byee