XFileSharing Free - 500 internal error

[hsdude]

I see that some had the same issue, but i still can't get this figured out, I've followed the instructions and set the permission but still get a 500 error.
any help would be appreciated. I do have access to .htaccess

[Lemoncip]

I cant open one of my previous files, and am getting the above error message. Can you help me resolve please?