In the process of upgrading Drupal 6.x to 7.x I'm facing a problem that makes all my views show nothing relevant. (I believe the problem is here but I'm not sure, I don't know. That's why I'm asking):
After using the migrate field from CCK module in Drupal 7.x most of my views end up with Broken/missing handler whether it is in Field, Filters Criteria or Relationships.
On the other side, when using the migrate field module, most of the fields have a message similar to this attached with them. (The field names change.)
Missing formatter: The 'hidden' formatter used in 3 view modes for the field_phone field is not available, these displays will be reset to the default formatter.
Or I get this message.
Changed field type: The 'field_source_file' field type will be changed from 'filefield' to 'file'.
Or I get this message one too.
The field uses the view list_of_project_for_captain_log to determine referenceable nodes. You will need to manually edit the view and add a display of type 'References'.
Is this the reason why most the views have a Broken/missing handler than makes them not work properly? If yes, what can I do, if not what else could be the reason for such problems and what should be done?