1. Profile upload failed
**Problem**: Error message displayed when uploading profile
**Solution**:
- Check if the image format is supported (JPG, PNG, GIF, etc.)
- Confirm that the image size does not exceed 2MB
- Try to reselect the image file
- If the problem persists, you can choose the default profile
2. Username already exists
**Problem**: Prompt "Username is already in use"
**Solution**:
- Try another username
- Add numbers or letters after the username
- For example: `shop_owner` → `shop_owner_2024`
3. Password does not meet requirements
**Problem**: Password verification failed
**Solution**:
- Make sure the password is between 6 and 20 characters long
- Check if it contains special characters
- Try a more complex password combination
4. Incorrect referrer username
**Problem**: Prompt "Referrer does not exist"
**Solution**:
- Confirm that the referrer username is spelled correctly
- Contact the referrer to confirm the username
- If you cannot obtain the referrer information, please contact customer service
5. Network connection problem
**Problem**: Network interruption during registration
**Solution**:
- Check whether the network connection is normal
- Refresh the page and re-enter the information
- If the problem persists, please try again later