Internal error not handled System.InvalidOperationException at System.Data.OracleClient.OracleConnection.CheckError

I have a web application and I am getting an error related to oracle.

System.InvalidOperationException Internal error not handled (-2) at System.Data.OracleClient.OracleConnection.CheckError()

This is the scenario.

s开发者_JAVA技巧ql1

select * from table1@otheroracledb

sql2

select * from table2

I am getting this error when I run the sql1 and then sql2.

What could be the problem?