Configure the library
| 1 | rollbar.configure(access_token = NULL, env = NULL, root = NULL)
 | 
| access_token | Access token from your Rollbar project | 
| env | Environment name. Any string up to 255 chars is OK. For best results, use "production" for your production environment. | 
| root | Absolute path to the root of your application, not including the final / | 
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