FSB Pro uses the current user's Temp folder to compile the custom indicators.
I'm not sure what causes the issue, but it is unusual.
Please try to reinstall the program.

Thanks for the reply, Popov. I have tried reinstalling it multiple times, but the issue persists.

But the program itself starts up fine?

Errors say that it can't find custom indicator files. I'm not sure why it directs to Temp folder instead of Indicators folder. Did you use full admin rights when installing and while starting up the program? And are the indis present in the Indicators folder?

Thanks for the reply. Yes the program start fine. I used the full admin privilege to install it the program. And the indicators are present in the  Indicators folder.

Errors say that it can't find custom indicator files. I'm not sure why it directs to Temp folder instead of Indicators folder. Did you use full admin rights when installing and while starting up the program? And are the indis present in the Indicators folder?