VixVM_Open() doesn't find a virtual machine

Hello guys, I'm trying to execute the samples PowerOn.c code found in the VIX folder, it is able to connect to vmware server 2.0 but when it try to open a virtual machine the code break. So I insert a Vix_GetErrorText() function to understand why the program doesn't work fine and the response is : The virtual machine cannot be found.

I'm using VIX 1.5. My Operating system is Ubuntu 7.10. the virtual machine is registered on the host ( i added it by Web access console).

in the shell I typed: ./myProgram.out test/test.vmx (yes the datastore is called standard as default).

any advice?

thx

Hellblade