What does this error mean?

As the error states, a write was attempted against a table that does not exist.

Why does this error occur?

This error should not be reached since the CQL parsing mechanism should recognize that the table does not exist. However, if this were to fail and the write passes through, Cassandra looks for the table metadata in order to include the proper information when writing to the commit log and memtables. If this value is null, the error is thrown.

How do you fix this error?

Look at the information for the table from the error message and verify that it exists. Modify the code for the writes as appropriate. If the table exists and you are hitting this error, please file a ticket with DataStax Support.