Power BI Report Builder connect to Oracle database

Same issue for me also : 

An unexpected error occurred
A data source used by this report returned an error.
If you continue to experience this error contact the report author or
data source owner quoting: DM_GWPipeline_Gateway_ProviderDataAccessArgumentError
Activity ID: 31e3b41f-41ff-50c9-cda7-bace3e5c32c9
Request ID: 31e3b41f-41ff-50c9-cda7-bace3e5c32c9
Correlation ID: 2c99581f40c14f3fa8ef27c894d740a6
Status code: 200
Time: Mon Jun 08 2020 14:50:08 GMT-0500 (Central Daylight Time)
Cluster URI: https://northcentralus.pbidedicated.windows.net/webapi/capacities/F3068F2C-A61E-45CC-AB7B-B66571036DF3/workloads/RsRdlEngine/rs/automatic/v1.0

Do we need to install only the ODAC 12.2c (I already did this),

or do we need to install ORACLE Client 32bit + 64bit on the Gateway server ?

Thanks