How to solve this? whenever I'm trying to open codeblocks an error....

[tordaniel]

This error comes up whenever I'm trying to run codeblocks on opensuse..

Another program instance is already running.
Code::Blocks is currently configured to only allow one running instance.

I'll be grateful with some help here because this error makes me annoyed.

[dako]

I'm assuming you don't have another instance of the program running. There is likely a lock file that the program checks on startup. If the program crashed or otherwise terminated abnormally, it may have left a stray lock file. Look in /tmp for any files with codeblocks in the filename and remove it.