Foreman does not create a new VM using VMware-Compute-Ressource with the message:

Kann nicht speichern
Konnte die Recheninstanz esx-252.*BLA*.de auf VMware (VMWare) nicht starten: NotSupported: Der Vorgang wird für dieses Objekt nicht unterstützt.

In production.log there is this message:

Started POST "/hosts" for *IP* at Mon Nov 18 16:28:22 +0100 2013
Processing by HostsController#create as */*
  Parameters: {"capabilities"=>"build", "host"=>{"compute_resource_id"=>"1", "puppetclass_ids"=>[""], "type"=>"Host::Managed", "mac"=>"", "disk"=>"", "name"=>"esx-252", "domain_id"=>"1", "ptable_id"=>"3", "environment_id"=>"1", "puppet_ca_proxy_id"=>"1", "managed"=>"true", "overwrite"=>"false", "hostgroup_id"=>"", "build"=>"1", "model_id"=>"", "interfaces_attributes"=>{"new_interfaces"=>{"type"=>"Nic::Managed", "mac"=>"", "name"=>"", "domain_id"=>"", "_destroy"=>"false", "provider"=>"IPMI", "ip"=>""}}, "operatingsystem_id"=>"1", "compute_attributes"=>{"memory_mb"=>"2048", "path"=>"/Datencenter/*BLA*/vm/Ubuntu", "start"=>"1", "cpus"=>"2", "cluster"=>"Cluster", "interfaces_attributes"=>{"new_interfaces"=>{"network"=>"Hosting", "_delete"=>""}, "0"=>{"network"=>"Server-Netz", "_delete"=>""}}, "volumes_attributes"=>{"new_volumes"=>{"name"=>"Hard disk", "size_gb"=>"10", "thin"=>"true", "datastore"=>"DC_VOL11gu", "_delete"=>""}, "0"=>{"name"=>"Disk1", "size_gb"=>"30", "thin"=>"true", "datastore"=>"DC_ESX_70", "_delete"=>""}}}, "progress_report_id"=>"[FILTERED]", "ip"=>"*IP*", "comment"=>"", "puppet_proxy_id"=>"1", "subnet_id"=>"1", "medium_id"=>"3", "enabled"=>"1", "architecture_id"=>"1", "provision_method"=>"build", "root_pass"=>"[FILTERED]"}, "authenticity_token"=>"oCL9dHXsrjZ+WqBhr4RNFMbcK8RhTwCmpg+46KfKUls=", "utf8"=>"✓"}
Adding Compute instance for esx-252.*BLA*.de
Create DHCP reservation for esx-252.*BLA*.de-00:50:56:81:1d:f0/*IP*
Add the TFTP configuration for esx-252.*BLA*.de
Fetching required TFTP boot files for esx-252.*BLA*.de
Powering up Compute instance for esx-252.*BLA*.de
Konnte die Recheninstanz esx-252.*BLA*.de auf VMware (VMWare) nicht starten: NotSupported: Der Vorgang wird für dieses Objekt nicht unterstützt./usr/share/foreman/vendor/ruby/1.8/gems/rbvmomi-1.6.0/lib/rbvmomi/vim/Task.rb:11:in `wait_for_completion'
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script/rails:6
Rolling back due to a problem: Die Recheninstanz esx-252.*BLA*.de starten     1000     failed     esx-252.*BLA*.desetComputePowerUp
Delete the TFTP configuration for esx-252.*BLA*.de
Delete DHCP reservation for esx-252.*BLA*.de-00:50:56:81:1d:f0/*IP*
Removing Compute instance for esx-252.*BLA*.de
Failed to save: Konnte die Recheninstanz esx-252.*BLA*.de auf VMware (VMWare) nicht starten: NotSupported: Der Vorgang wird für dieses Objekt nicht unterstützt.
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But if I commit the creation of this VM another time, Foreman will create a host inside itself, but not the VM on VSphere. This message will be shown in the VM tab in the host-object:

'esx-252.xxx.xx' wurde nicht unter 'VMware (VMWare)' gefunden

'esx-252.xxx.xx' konnte nicht gelöscht werden oder 'VMware (VMWare)' reagiert nicht.

Started POST "/hosts" for *IP* at Mon Nov 18 16:36:35 +0100 2013
Processing by HostsController#create as */*
  Parameters: {"capabilities"=>"build", "host"=>{"compute_resource_id"=>"1", "puppetclass_ids"=>[""], "type"=>"Host::Managed", "mac"=>"00:50:56:81:1d:f0", "disk"=>"", "name"=>"esx-252",
 "domain_id"=>"1", "ptable_id"=>"3", "environment_id"=>"1", "puppet_ca_proxy_id"=>"1", "managed"=>"true", "overwrite"=>"false", "hostgroup_id"=>"", "build"=>"1", "interfaces_attributes" 
=>{"new_interfaces"=>{"type"=>"Nic::Managed", "mac"=>"", "name"=>"", "domain_id"=>"", "_destroy"=>"false", "provider"=>"IPMI", "ip"=>""}}, "operatingsystem_id"=>"1", "progress_report_id
"=>"[FILTERED]", "ip"=>"*IP*", "comment"=>"", "puppet_proxy_id"=>"1", "subnet_id"=>"1", "medium_id"=>"3", "enabled"=>"1", "architecture_id"=>"1", "provision_method"=>"build",
 "root_pass"=>"[FILTERED]"}, "authenticity_token"=>"oCL9dHXsrjZ+WqBhr4RNFMbcK8RhTwCmpg+46KfKUls=", "utf8"=>"✓"}
Create DHCP reservation for esx-252.*BLA*.de-00:50:56:81:1d:f0/*IP*
Add the TFTP configuration for esx-252.*BLA*.de
Fetching required TFTP boot files for esx-252.*BLA*.de
Redirected to http://puppet.gbv.de:3000/hosts/esx-252.*BLA*.de
Completed 302 Found in 644.5ms (ActiveRecord: 40.8ms)