login failed simultaneous session limit reached

hi guys i am newly know about mikrotik and i am realy impressed, i have a small pppoe setup with user manager every thing is running fine but i am tired to solve just one problem which is (login failed simultaneous session limit reached), can any body help me guys how to fix this problem.

i have a server machine with mikrotik os 5.18 please help i will very thankful to all of you.

Hi,
In what instance are you getting the error? Kindly describe the scenario.

Maybe your license is to small for the clients number…