OWS-05200 after upgrading OWS2.1 -> OWAS 3.0

I upgraded today my OWS 2.1 to OWAS 3.0 and followed all the steps for upgrading my cartridges and WRB.
But when I try to launch my application, I have the text 'An error occurred while the cartridge performed authorization check.' in my browser and the following error in my log file: OWS-05200: Agent www_gamma not found in configuration file`

Can somewhone help me with this ?

TIA, Zahi

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Zahi Al-Jamous			e-mail: aljamous_at_crv.pechiney.fr
Groupe GIL
Pechiney-CRV
BP 27				tel (work): +33.(0)4.76.57.82.45
F-38340 Voreppe			tel (cell): +33.(0)6.14.55.16.88