Parse invalid session token (Code: 209, Version: 1.7.1)

Question

I have just update both my Parse and Facebook SDK\'s (1.7.1 and 4.0 respectively) - both were an absolute pain to get working I might add!

However I now getting 209

Answer 1

Some of the answers posted were temporary fixes - however the problem could reoccur later if a user logged out and tried to log back in again - I think this was due to me allowing anonymous users also - the only way I could clear it is to call [pfuser logout] prior to log in