Hello,
thanks a lot for the answers. i tried to reimport the vmware-vmosdk-vc40.dar file but this didn't solve my problem.
But now i found a working soluttion
1. I unpacked the vmware-vmosdk-vc40.dar file with 7zip.
2. I imported the com.vmware.library.vcenter.package (in vmware-vmosdk-vc40/resources/packages )into the vCenter Orchestrator Client (Packages right click import)
After this i could use the vim3WaitTaskEnd Action.
Malte