Error: Access to Oracle migration

am trying to migrate MS access to oracle using Oracle work bench but my tables are empty. Getting error
Unable to migrate data from source table "SUMMARY_OF_METHODS_1" to destination table billing.SUMMARY_OF_METHODS_1 :
[Microsoft][ODBC Microsoft Access Driver] Could not find file "(unknown)".
I have checked that I have proper user dsn for Ms Access database.
I have xml file in same folder where .mdb is.

Please refer to MS Access Data Migration posting.

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