How to resolve Path to SOPC Builder directory is not found

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I am just starting with Altera OpenCL. I have been able to compile and run some of the example designs. Yesterday I tried using the emulator. After some missing environment variables I got it working. Today I tried some more emulations but whenever I want to compile, either for emulator or for chip I get the message:

aoc: Unable to determine the execution envoronment of the Altera SDK for OpenCL
aoc: Detailed error: Internal error: Path to SOPC Builder directory us not found!

I assume I have an enviroment variable wrong, but which one, and how do I find out which it is. I could run checks on all variables but that takes a lot of time. Could you point me to the right variable?

Or, if it has another couse, correct me and point me to the correct problem.

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Do you solve this problem ?I found the same problem lately?