56dce68f_ntlyPlus_API_v1_0_by_apiary_io__Resolution
[Http Status Code] 200 [Sently Plus Error Code] 5008 [Description] List data validation failed [Scenario] One or more of the posted items has data errors [Resolution] 
Please check the responseData key for the Errors array (see the example above) to see which items had errors. You may post the items again after correcting the specified errors.
SentlyPlus API v1.0—by apiary.io
Resolution