If you have STK 11, STK 12, and STK 13 on the same machine, their licensing components may conflict. The older version might point to a deprecated license server.
If all else fails.
STK licenses are often "floating" – meaning a limited number of seats exist. If 10 engineers are using STK and you are the 11th, you will see a variant of this error. a current stk license could not be found
Before touching any config files, verify your license status: If you have STK 11, STK 12, and
If you have exhausted all steps above and still see the error, gather the following information before contacting or your internal IT: If you have STK 11