Magento Item Export Error Message: 'a) No Matrix Value mappings found; fieldId:..'

Error on Item Export

Error Message: 'a) No Matrix Value mappings found; fieldId: b) Matrix value lookup did not return a result'

Reason: This occurs when a particular Matrix option field’s value mapping is missing in the Magento Matrix Value Mapping Record.  a) NetSuite Colour was not mapped. b) When Magento Colour was left blank.

Resolution:

Find the specific option value id in Magento and update the Magento Matrix Value Mapping Record accordingly.