#40 ORA-02005: implicit (-1) length not valid for this bind...

[randolf_geist]

See other bug regarding version detection. This error seems to be raised when using a V10.1 client and/or server and DBMS_OUTPUT is enabled. SQLTools++ attempts to use the explicit 10.2 feature of extended row size and unlimited output size when connected to 10g, but 10.1 doesn't support this, it's only 10.2 that introduced that enhancement.