Hi Marco,
Thanks for your replay, i even tried to grant the user "DBA" privilege temporarely to check maybe a missing privilege is required. and shockingly i am still receving the same error.
also, i found out that i can see the table records in ArcCatalog under the "Preview" tab when i choose "Table".....However, when i choose "geogrpahy" option the error pops up.
i have also tried rebuilding and analyzing the index through geoprocessing tools, and still facing the same problem.
Regards,