"No valid user session" and "An error occurred while TRUECHART was loaded".

Title

When dragging the custom object "TRUECHART" it displays the error "No valid user session" and "An error occurred while TRUECHART was loaded".

Cause

The error message can appear for the following cases:

Case 1 : The user is an admin user (which has neither "Consumer" nor "Designer" permissions by default)

Action

Check the user you are trying to use TRUECHART . It should not be a admin user .

To find out which user –

On Browser click on F12 which opens the  console and open the app and try adding TRUECHART

On Console to go to – Network Tab – and filter search  as "Index"

Get the front end session and from that request - go to form data where you can find the username . 

Resolution

Case 1 : username in the backend needs to be "DOMAIN\administrator", and not just "Administrator"

Try with a different domain/user 

or

Create a local user :

In the top-right in the user administration  page there is a link "Create local user", you can create a DOMAIN\administrator account this way.