I got this error after updating a triggered action. The cause was a mismatched data type between the field I wanted to update and the field that contains the data.
The thread referenced by RuisiHansamu is basically the same problem, in reverse. They changed the data type of their table field which caused a mismatch in a data type used in their triggered action commands. (The moral to the story here is don't change data type for a field that has any data or dependencies. To make a data type change, best to create a new field and configure relationships, forms and triggers to switch from the old to the new.)
If you see this error, it's likely caused by a calculation somewhere.