proxmoxer.core.ResourceException: 500 Internal Server Error

[HuHu]

Hi all,

I have a well running python script to deploy KVM VMs with personal permissions and automatically naming. After a PVE update (3 or 4 months ago) I got this error message:

raceback (most recent call last):
File "/usr/local/bin/clone_template_linked.py", line 118, in <module>
name="{:s}-{:s}-{:02d}".format(prox_klasse, templates[template_no]['name'], count+1))
File "/usr/local/lib/python3.4/dist-packages/proxmoxer/core.py", line 97, in create
return self.post(*args, **data)
File "/usr/local/lib/python3.4/dist-packages/proxmoxer/core.py", line 88, in post
return self(args)._request("POST", data=data)
File "/usr/local/lib/python3.4/dist-packages/proxmoxer/core.py", line 79, in _request
raise ResourceException("{0} {1}".format(resp.status_code, httplib.responses[resp.status_code]))
proxmoxer.core.ResourceException: 500 Internal Server Error​

What is going wrong?
Is a class definition or any kind syntax new?
Any ideas?

Thanks in advance, CHristian