Filter program 'qtplasmac.gcode' exited with error

After not using my table for a couple of weeks, I am getting this error when opening a file.  after seeing this I took the opportunity to upgrade to latest version hoping it might sort it but it is still exactly the same.  It was working fine last time I used it.  Any thoughts?The filter program 'qtplasmac.gcode' that was filtering ***.ngc exited with an error.

Input/output error is usually failing hard drive or inability to read/write to it.

Many thanks for the quick reply and solution, it seems to work fine if I load a file from a usb stick so there must be an issue with my network drive. Thanks again!