Hello Suyash,
The error you are receiving above during an InfoPath Form migration could be related to the connection type you are using. The Native Web Service (NWS) and Database (DB) connection types cannot be used to migrate InfoPath Forms because these types of connections cannot fully access the source and target metadata.
Please visit the following link for more information on how InfoPath Form are migrated > www.metalogix.com/.../infopath_forms_migration.html
Kind Regards
The connection I am using to connect source is DB connection and for target its "MEWS" Metalogix SharePoint extension web service....will this still cause issue, can you please arrange quick call for this?