Integrating MongoDb with power bi issue..

Hi i’m new to mongo Db and power bi… I connected mongo db with power Bi with the help of odbc connector. Everything works fine and i can view and import most of the table but 3 tables cant be imported as it shows " DataSource.Error: The table has no visible columns and cannot be queried." even though there is lot of data in there…Due to which I am unable to automatically update the data in Bi and need to do it manually… Please help me out