# Error Code and Troubleshooting

| Error code | Message | Troubleshooting |
|:----|:----|:----|
| 1004 | sign invalid | The Access ID and Access Secret you entered are not correct. For more information, see entering credentials step in [Install Tuya Integration](.././docs/install.md). |
| 1106 | permission deny | <ul><li> Your app account is not linked to your cloud project. This operation is a must-do. For more information, see [Link devices by app account](https://developer.tuya.com/en/docs/iot/Platform_Configuration_smarthome?id=Kamcgamwoevrx#title-3-Link%20devices%20by%20app%20account).</li><li> Incorrect account or password. You must enter the account and password of the mobile app that you use to scan the QR code for linking devices to your cloud project on the [Tuya IoT Development Platform](https://iot.tuya.com/).</li><li>Incorrect country. You must select the region of your account of the Tuya Smart app or Smart Life app.</li></ul> |
|1100|param is empty| Empty parameter of username or app. Fill the parameters refer to the entering credentials step in [Install Tuya Integration](.././docs/install.md).|
| 2406 | skill id invalid | <ul><li>Make sure you use the Tuya Smart or SmartLife app account to log in. Also, choose the right data center endpoint related to your country region. For more details, please check [Mappings Between OEM App Accounts and Data Centers](https://developer.tuya.com/en/docs/iot/oem-app-data-center-distributed?id=Kafi0ku9l07qb).</li><li>Your cloud project on the [Tuya IoT Development Platform](https://iot.tuya.com) should be created after May 25, 2021. Otherwise, you need to create a new project. For more information, see [Operation on the Tuya IoT Development Platform](https://developer.tuya.com/en/docs/iot/migrate-from-an-older-version?id=Kamee9wtbd00b#title-3-Operation%20on%20the%20Tuya%20IoT%20Platform). </li></ul>|
| 28841105 | No permissions. This project is not authorized to call this API | Insufficient API permissions. You need to subscribe to the required [API services](https://developer.tuya.com/en/docs/iot/applying-for-api-group-permissions?id=Ka6vf012u6q76#title-2-Subscribe%20to%20API%20services) and [authorize](https://developer.tuya.com/en/docs/iot/applying-for-api-group-permissions?id=Ka6vf012u6q76#title-3-Authorize%20project%20to%20call%20APIs) your cloud project to use these API services. The following API services are required.<ul><li>Authorization</li><li>IoT Core</li><li>Smart Home Scene Linkage</li><li>IoT Data Analytics</li><li>Device Status Notification</li></ul> |