Graphmind - NetConnection.Call.BadVersion Error

Hello allthogether,
I get an NetConnection.Call.BadVersion Error, when I try to use a Graphmind-Field.

I installed the graphmind module, the amf-Server modul, the ZendAMF Framework and the services Modul.

The status report says: Everything is fine.
The amf Server says: everything is OK

---------schnipp --------------
This message is here to let you know your amfserver installation is ok!
The amfserver with Zend AMF is installed and working.

The amfserver version is: "7.x-3.03"
The endpoint name of this endpoint is: "amf"
The debug mode of the endpoint is ON. OFF is the recommended setting for any production site.
The amfserver uses the normal drupal session authentication mechanism. This is a default configuration for all services.

Number of other (optional) endpoint authentication methods: 1
-- Authentication module: services with settings:services

Number of classmappings defined: 2
###
-- actionscript 3 class: 'org.drupal.amfserver.User
-- php class: 'AmfServerUser'
###
-- actionscript 3 class: 'testserver1
-- php class: 'AmfServerUser'
---------schnapp -------------

Then I created a new content type with a graphmind field.

All I get is the little red error in the attached File.

Does anybody know, how to handle this thing ?

Greetings
Berthold