Cause
The character set specified is not allowed for this operation or is invalid
The character set specified is not allowed for this operation or is invalid
Ensure that the specified character set is valid
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm
https://community.oracle.com/message/1592972
https://community.oracle.com/message/613162
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