The Invalid Attribute is issued in the following situations:
'<attribute>' data type is invalid: the data type of the attribute is not valid.
Edit the entity attribute or structure attribute and set a valid data type for it.
'<attribute>' data type is invalid: '<entity>' has no attribute set as Identifier.: the attribute set in the Identifier property in not an Identifier attribute and there's no Identifier attribute defined in the entity.
Edit the entity, define the Identifier attribute, and set it on the Identifier property.
<attribute> data type must be set to 'Integer' to use 'Auto Number': the attribute is set as Auto Number but you can only use Auto Numbers with attributes of Integer data type.
Edit the entity attribute and either set its data type to Integer or disable it as Auto Number.
Entity Attributes | Error Messages