During installation of {{IMSMANG}} the error message "Internal error occurred: '''java.io.OptionalDataException'''".<br/>
The installation was interrupted and not all files were copied to the ''C:\IMSMAng'' folder.<br/>
Unusual update of the [[Environment Variables | environment variable ]] '''PATH''' was also observed.<br/>
The error was caused by a defective USB memory stick OR the files got damaged when they were copied to the USB memory stick.