Mysqli prepare error: Can't create/write to file '/tmp/#sql_53ee_0.MYI'

Hello,

I recently added Piwik Analytics to the local community website that I am managing; since I'm a FOSS fan and Piwik is awesomely FOSS!!! B) ;) But I haven't been successful in obtaining my statistics yet. The error that causes this problem is a Mysqli prepare error: Can't create/write to file '/tmp/#sql_53ee_0.MYI'.

Does anybody here seem to know a solution to this problem? Please do help me out.