Error adding user: maximum license count exceeded.

When you have deployed Issue Trackingg Anywhere Standalone on a 64-bit OS and you try to log in or try to add a new user , you might get the below error:

Error adding user: maximum license count exceeded.

The
cause of the error is that the application pool for ITA Standalone is
configured to run in 64-bit mode by default. To fix this, please follow:

1.    Find the application pool for ITA Standalone at IIS(7)->Sites->ITAS->Advanced settings:

2.   
Then Go to IIS (7)->(PC Name)->Application Pool->ITAS(see
above)->Advanced Settings, and you should see that
“(General)->Enable 32-bit Application” is “False”:

3.    So we need to change it to “True”, click Ok, then back to add serial code.