Unexpected response from server. The status code of response is '500'. The status text of response is 'System.ServiceModel.ServiceActivationException'. Term Store Management Tool

I am using the Term Store Management Tool to configure my menu and sub menu

Every time when i click SAVE button to config the node type: url or only text in NAVIGATION TAB (or click tab TERM DRIVEN PAGES) this message appear. So i can not set the menu parent node type to text only / and use many features

Can anyone help?

Thank you so much.

Unexpected response from server. The status code of response is '500'. The status text of response is 'System.ServiceModel.ServiceActivationException'