> ## Documentation Index
> Fetch the complete documentation index at: https://moengage-user-guide.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Common Errors in SMS and  RCS Campaigns

This article explains common errors you might see when sending SMS and RCS messages through MoEngage.

# Internal Errors

Following are a few errors that are generated by MoEngage while sending SMS & RCS messages:

| Error                                     | Description                                                                                                                                                                                                                                                                                                                                                                                                      |
| ----------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Personalization Failed                    | This error occurs when message personalization fails and no fallback message is configured. The system will not send the message to the user and generates the Personalization Failed error.                                                                                                                                                                                                                     |
| Invalid Mobile Number                     | This error appears if a user's mobile number is invalid. This includes scenarios where:   <br />- The **Mobile number** field is empty or contains placeholder values such as **None**, **N/A**, **undefined**, **null**, or **0**. <br />- The **Mobile number** contains non-numeric or Unicode characters, or is fewer than 4 digits long. <br />- The mobile number cannot be converted to the E.164 format. |
| Users removed due to Global Control Group | This error occurs when the user is part of the Global Control group, and hence, MoEngage did not send any message to the user.                                                                                                                                                                                                                                                                                   |
| Rejected because of DND                   | This error occurs when you attempt to send messages during the configured DND hours. MoEngage will not send the message to the user in such a case.                                                                                                                                                                                                                                                              |
| Not sent due to campaign level min delay  | This error occurs when the user qualifies for multiple messages from the same campaign, but the message is not sent because of the minimum delay settings between the campaign.                                                                                                                                                                                                                                  |

# Service Provider Errors

| Error          | Description                                                                              |
| -------------- | ---------------------------------------------------------------------------------------- |
| Failed to send | This error is displayed if the user ID hasn't been allowlisted on the GupShup dashboard. |