Is this happening with Windows or Linux/Mac? If it's Windows, try to update to the latest WinUAE version. Download ZIP file from www.winuae.net,
unpack the archive and copy the WinUAE.exe to AmiKit\WinUAE folder and replace the old executable there.
Isn't your harddisk full?
You can try to reset the attributes of all files. Open Shell (press Left-Amiga key + S key or Left-Windows + S) and type:
Protect AmiKit: +RWED ALL
Alternatively, if you haven't installed custom software to your AmiKit, consider uninstalling this ancient version of AmiKit and installing fresh AmiKit 7.