Oracle Database Error Code ORA-30689 Description :
improper value for ORA_DEBUG_JDWP
Error Cause:
An improper value was used for ORA_DEBUG_JDWP when trying to establish a connection to a debugger. The value either did not conform to the format of ORA_DEBUG_JDWP or was too long.

How to Solve :
Correct the value for ORA_DEBUG_JDWP and try again.