After upgrade D6 version to D7 -> PDO Exception error

Hi,

I just made an upgrade and wondered that there appeared many pdo exception errors in database logging report:

PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'machine_name' in 'where clause': SELECT token_custom.* FROM {token_custom} token_custom WHERE (machine_name IN (:db_condition_placeholder_0)) ; Array ( [:db_condition_placeholder_0] => title ) in token_custom_load_multiple() (line 237 of /path/to/project.com/dev/sites/all/modules/token_custom/token_custom.module).

Could it be that the column was not needed in D6 version and the upgrade path is missing in the D7 version?

Best,
Tobias