Dear Burak,
I have never seen these errors before and I am trying to understand when they happen. I think that you are having these error messages from the WinEPIC interface. Have you tried to uninstall and install again WinEPIC. Are you using the Central Texas database that comes with the installer? Have you modified any crop parameters before having this error?
Again, try to uninstall and then install again WinEPIC, then try to run a simulation using the default and sample setting you will find in the "Create Runs" window.
Let me know.
Luca