cannot perform mosaic operation: string

Try the following links for this error:

http://docs.oracle.com/cd/E16655_01/server.121/e26079/e12700.htm

https://community.oracle.com/message/2678029

https://community.oracle.com/message/2416747

https://community.oracle.com/message/4134557

https://community.oracle.com/message/1344774

https://community.oracle.com/message/1329760

https://community.oracle.com/message/1510003

https://community.oracle.com/message/2514769

https://community.oracle.com/message/9202665

https://community.oracle.com/message/3688362

https://community.oracle.com/message/3676122

https://community.oracle.com/message/3671527

https://community.oracle.com/message/794476

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