Workaround 1:
For SharePlex for Oracle version(s) 9.0 - 9.2.0.
a. Shutdown SharePlex and run ora_setup.
b. If ora_setup does not resolve the issue, activate the config file again.
Note: the activation will fail with same error, but it will generate a new router file with a new actid under $sp_sys_vardir/db folder.
c. Under $sp_sys_vardir/db directory, copy the new router file to the file with previous actid with same permission and ownership and start reader.
d. Activate config again as previous one was failed.
Workaround 2:
For SharePlex for Oracle version 9.2.1.
Shutdown SharePlex and Run Ora_setup.