This error came up when selecting the Add Frame button.
Before the above cause was known the below fix was used to correct the issue, it worked as it would have reset the left explorer window open again.
It was fixed by deleting the V6.ini file from the c drive. the C drive needs to be search to find these files as per below;
Please contact Alspec Software Support 1300 760 106 or Soft-tech 1300 139 980 for further assistance.