PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'semaphore' doesn't exist
I also got the same problem.
Then i realizez that when migrating, i copy and paste from old server. And when i opend the database on my new server and choose a table in it, it was emty giving me error: "table does not exist". So check out if it is importing the content of the data firt before continuing with your search.