AcquireConnection method call to the connection manager Oracle Connector failed

Question

I have setup the connection manager from SSIS to Oracle as:

In the Oracle source:

I can preview the data successfully:

However, upon attempting to execute the packge, the erorr appears as:

SSIS package "C:\Users\kakah\Documents\Visual Studio 2015\Projects\TestExcel\TestExcel\INV_MTL_SYSTEM_ITEMS_TL.dtsx" starting.
Information: 0x4004300A at Data Flow Task, SSIS.Pipeline: Validation phase is beginning.
Warning: 0x802092A7 at Data Flow Task, OLE DB Destination [17]: Truncation may occur due to inserting data from data flow column "DESCRIPTION" with a length of 600 to database column "DESCRIPTION" with a length of 150.
Warning: 0x802092A7 at Data Flow Task, OLE DB Destination [17]: Truncation may occur due to inserting data from data flow column "LONG_DESCRIPTION" with a length of 2000 to database column "LONG_DESCRIPTION" with a length of 150.
Error: 0x2C0 at INV_MTL_SYSTEM_ITEMS_TL: OCI error encountered. ORA-12154: TNS:could not resolve the connect identifier specified
Error: 0x20F at Data Flow Task, Oracle Source [62]: The AcquireConnection method call to the connection manager Oracle Connector failed with error code 0x80004005.  There may be error messages posted before this with more information on why the AcquireConnection method call failed.
Error: 0xC0047017 at Data Flow Task, SSIS.Pipeline: Oracle Source failed validation and returned error code 0x80004005.
Error: 0xC004700C at Data Flow Task, SSIS.Pipeline: One or more component failed validation.
Error: 0xC0024107 at Data Flow Task: There were errors during task validation.
SSIS package "C:\Users\kakah\Documents\Visual Studio 2015\Projects\TestExcel\TestExcel\INV_MTL_SYSTEM_ITEMS_TL.dtsx" finished: Failure.

What could I be missing? How can this be resolved?

Answer 1

If you right click on the project and go to properties --> Configuration Properties --> Debugging, did you make sure Run64BitRuntime is False? Sometimes that gets toggles to True and will break it.