1. Make sure you are logged in, to log in click on the "Log In" button in the upper right corner (this will set your api key and access token)
2. Select the language
3. Make sure the authentication header is set to "Access Token Auth" (the default)
4. Fill in any required query parameters in the middle of the page.
5. Click on "Try It!"

The message is probably coming because of step 1 or step 3. I sometimes find that I need to do a screen refresh to get some of the steps to work, which may undo some of the earlier steps.

@robbie3999 said:

1. Make sure you are logged in, to log in click on the "Log In" button in the upper right corner (this will set your api key and access token)
2. Select the language
3. Make sure the authentication header is set to "Access Token Auth" (the default)
4. Fill in any required query parameters in the middle of the page.
5. Click on "Try It!"

The message is probably coming because of step 1 or step 3. I sometimes find that I need to do a screen refresh to get some of the steps to work, which may undo some of the earlier steps.

did the same steps but still giving this error everytime