This error is most likely due to an incorrect/incomplete .NET setup. Firstly make sure you have .NET v3.5 SP1. Check out these threads for further info:
Could you kindly share what you did to rectify the original issue? It might assist others.
Regarding your “permission denied” error, it appears that MT4 cannot access the FXT file. Is it possible you are trying to back-test while Tickstory has not yet completed the export?
Tickstory completed the report. for your informatuion i use mt4 latest build. version 4.00 build 845.
i could not launch mt4 from tickstory, says option not available. so i opened mt4 seperately.
please do the needful to solve this issue.