Invalid token: Token Signature could not be verified

Hi,
I've been trying to do a load test from SoapUI to the DreamFactory (Ver. 2.01). Here is what i've done:

1. I have login, and get the session token
2. Set the session token to "X-DreamFactory-Session-Token" and the API key to "X-DreamFactory-Api-Key" (in the request headers)
3. Set the roles in the admin console
   however, when i called the request, I've get this following error :

I wonder if there's any steps that i miss ? Thankyou

{"error": {
"context": null,
"message": "Invalid token: Token Signature could not be verified.",
"code": 401,
"trace": [
"0 [internal function]: DreamFactory\Http\Middleware\AccessCheck->handle(Object(Illuminate\Http\Request), Object(Closure))", ... ]
}}