Unexpected response from the server in vkernel Modeler

Dear

i have been download vkernel modeler 1.2.1 and brought up in virtual machine and make network config and access to cosole by http://myserveripaddress

but i got below error:

Unexpected response from the server

TypeError: Object doesn't support property or method 'createContextualFragment'

responseText: {"result":false}

message: Object doesn't support property or method 'createContextualFragment'

description: Object doesn't support property or method 'createContextualFragment'

number: -2146827850

please let me know how can i solve this problem.

regards,

Mahdi Bashiri