Do you have a current VMware support contract? If so you can contact VMware Support through the details on this page -> VMware Support Contact Options
If you aren't sure if you have a valid support (SnS) contract, you can check by logging into "My VMware" and choosing "Support" -> "Support By Product" from the top menu.
If you are using the free products, or don't have current SnS, hopefully some one here on the community site can assist you.
I hope you tried this Kb: - Running virtual machine is inaccessible and has missing configuration files
if it doesn't work out: - Try removing the VM from the inventory and adding it back.
you can check this blog: - error occurred in the vSphere Client
Please let me know if you have queries.