ORA-24813: cannot send or receive an unsupported LOB (4259550)

For a table with CLOB data type, "copy data to another schema" from schema browser, will have this error if the oracle client version doesn't match the server version.

An attempt was made to send a LOB across the network, but either the server does not support the LOB sent by the client, or the client does not support the LOB sent by the server. This error usually occurs when the client and server are running different versions of Oracle.

Make sure oracle client and server has the same version. Use a version of the Oracle that supports the LOB on both the client and the server.