> For the complete documentation index, see [llms.txt](https://trillbit.gitbook.io/trillbit-sdk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trillbit.gitbook.io/trillbit-sdk/android-support/trill-sdk-for-android/troubleshooting/error-codes.md).

# Error codes

| Error code | Error message                                                                  | Description                                                                                                                                                  |
| ---------- | ------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| 402        | Sender /Receiver is already running. HINT: Stop sender to start playing again. | This error is seen when the user tries to start the SDK receiver or sender method more than one time.                                                        |
| 403        | SDK Not Initialised                                                            | The SDK Throws this error when SDK methods are being used without initialising SDK Object. Please make sure SDK objects are initialised properly before use. |
| 404        | Missing Permission                                                             | This error is received when the user tries to initialise SDK without required permissions.                                                                   |
| 501        | Invalid SDK Key                                                                | Wrong SDK Key passed while creating TrillSDK object.                                                                                                         |
| 410        | Already Playing                                                                | This  error comes when SDK is playing and user tries to play without stopping the current playing event.                                                     |
| 411        | Not Playing                                                                    | This error is seen when SDK is not playing and user tries to stop playing.                                                                                   |
| 412        | Already Recording                                                              | This error is seen when SDK is receiving and user tries to receive without stopping the current receiving event.                                             |
| 413        | Not Recording                                                                  | This error is seen when SDK is not receiving and the user tried to stop receiving.                                                                           |
| 414        | Cannot send while receiving                                                    | This error is seen when SDK is in receiving mode and user tries to play something.                                                                           |
| 415        | Cannot receive while sending                                                   | This error is seen when SDK is in playing mode and user tries to call receiver methods.                                                                      |