[rt-users] Help please ActivityReport extension doesn't work

[support at pureview.com]

Help please.

Suddenly my Extension ActivityReport stop working.

I'm getting:
An internal RT error has occurred. Your administrator can find more
details in RT's log files.

My log file:

[24927] [Sat Sep  6 05:27:11 2014] [error]: read_file: could not open file
'/opt/rt4/local/plugins/RT-Extension-ActivityReports/html/Reports/Activity/Elements/Wrapper'
for reading: Permission denied

Any one  can give me clue how to fix this issue.

I'm running 4.2.1 / RH6

Thank you,
David