Template->make_filename():error - file message_inline .tpl does not exist

I am Admin founder Lindsay
Even with correct name / password
tells me username/password incorrect
so click forget password , no such user
ok try re-register , name already taken
try more times, 10 max attempts wait 90min
ok now .......

Hello,

It might be that you're entering the incorrect password & also the username, if you forgot your founder password, please check the link on my signature that says 'Lost your founder password?' and follow further instructions.

Also, kindly check if you're getting the same issue as this:
https://help.forumotion.com/t123779-support-forums-issue-being-logged-out-and-unable-to-log-in

If you are encountering the problem on the link/thread above,  please clear your browser's cache/cookies. please also provide a screenshot of the error message you're getting(if there is), also, what browser are you using? Did you try another one?