JCoException (180) JCO_ERROR_DESTINATION_DATA_INVALID error

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Hello SAP Experts,

I'm relatively new to SAP but would welcome any advice as to what might be causing the following error.

I created a Webdynapro project and deployed it as a BAPI successfully.

I changed the GUI to reference other fields in the model.

After doing that, every time I try and deploy and run I get the error message:

com.sap.conn.jco.JCoException: (180) JCO_ERROR_DESTINATION_DATA_INVALID: Destination WD_RFC_METADATA_DEST was changed. Refresh the destination instance with the JCoDestinationManager.

What does it mean by refresh the destination instance with the JCoDestinationManager? How do I do this?

I tried recreating the destinations just in case that was a problem, but to no avail.

Thanks in advance for any tips or help you can provide.

Ian