Aplication Error #2800

[Reivaj]

Token error due to end time (or similar) anybody knows how I can fix that error?

APPLICATION ERROR #2800
Invalid form security token. Did you submit the form twice by accident?

I have the last version of Mantis 1.2.17

Thanks in advance

[Reivaj]

Nobody knows anything??

[Reivaj]

Not even from the staff ??