Cannot complete startup on . Exception was thrown: Schema has changed: Data Type incompatibility...

I am getting an error:

Cannot complete startup on <ProjectName>. Exception was thrown: Schema has changed: Data Type incompatibility. Found type 'System.String' but expected 'System.Object' on Column <NameOfColumn>: Data Type incompatibility. Found type 'System.String' but expected 'System.Object'

The datatype that the user is attempting to log does not match the Datatype that is expected by the Database. Please check the datatype being used in the column that is specified in the error. The item that's datatype is in question can be found under <ProjectName>.

It also may prove useful to ensure that the right item is being mapped to the desired <ColumnName> in the Data Storage under item to field mappings.