Extractor - finished with RC:8 - Incorrect Client. Called 001

Hello experts,

In our Solution manager in SLG1 we are having the following error:

=> Finished with RC: 8  ( INCORRECT CLIENT. CALLED: 001 REACHED: 100 )

Message no. BL001

Normally 100 is the client we use for the configuration of Solution Manager. Could you please help how to solve this?

In which step of Solman Configuration should we check and correct this issue?

Thanks and Regards