How to fix the Oracle error NNL-00014: unknown data type “string”?

In this post, you’ll learn more about the Oracle ErrorNNL-00014: unknown data type “string” with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

NNL-00014: unknown data type “string”

Reason for the Error NNL-00014: unknown data type “string”

Cause: The user issued a name server request which contained an unknown data type.

How to fix the Error NNL-00014: unknown data type “string” ?

You can fix this error in Oracle by following the below steps

Action: It is possible that the server had no information on the type, but automatically fetched it in response to the failing request. Re-issue the failing request; if the server has in the meantime fetched the appropriate data type information, the error will go away. If the error persists, the data type is probably invalid.