Contents Index Ignoring updated row (old values) Invalid character data encountered in upload -- using NULL

MobiLink Synchronization Reference
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Invalid character data encountered in upload -- substituting '?'

Item Value
Warning code 10025
Level 5
Probable cause 

Character data originating from the client needs to be translated before being entered into the consolidated database. This was not possible for all characters. A '?' will be substituted for each problematic character.

Contents Index Ignoring updated row (old values) Invalid character data encountered in upload -- using NULL