Twitter responds with json but oauth exception thinks its a string and doesn't parse it

[maryalbanese]

In twitterOauth.php if there is an exception in the call to this:

$result = $this->oAuthRequest($url, 'POST', $parameters);

returns JSON instead of a simple string as shown here

{"errors":[{"code":415,"message":"Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings"}]}

So the code then throws an exception with $result as the exception message instead of parsing the json.
so that e->message is
"errors":[{"code":415,"message":"Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings"}]

The added double quotes inside the message causes problems when outputing what is assumed to be a string

Expected behavior
On exception e->message should be a simple string, not json

Actual behavior
e->message is json

Versions:

• TwitterOAuth: [e.g. v4.0.1]
• PHP: v [e.g. v7.4.33]