Hi there! I'm sorry to hear that you're encountering an error when opening the app. Let's work together to resolve this.

Could you please provide a bit more detail about the error message you're seeing? For example, does it have a specific error code or description? Knowing this will help me to guide you more effectively.

When I open the app..it shows error and then retry..I’m not able to stream any song

Thanks for providing more details! It looks like you're running into an error when trying to stream music on the Demus app. Let's try a few troubleshooting steps to fix this issue:

1. Restart the App: Double-click the home button or swipe up from the bottom (if your iPhone doesn't have a home button) to open the app switcher. Swipe up on the Demus app to close it, then reopen it.

2. Check for Updates: Go to the App Store and see if there’s an update available for the Demus app. An update may contain bug fixes that could resolve the issue.

3. Check Your Internet Connection: Ensure that your iPhone is connected to a stable Wi-Fi or cellular network. You can try toggling the Wi-Fi off and on.

4. Clear App Cache: If the app allows, clearing the cache or data can help. Unfortunately, iOS doesn’t have a direct method to do this, but uninstalling and reinstalling the app can serve the same purpose.

5. Reinstall the App: If the steps above don’t help, you might want to try uninstalling and reinstalling the Demus app. To do this, tap and hold the app icon until it wiggles, then tap the 'X' to delete it. Reinstall it from the App Store afterward.

If these steps don’t seem to resolve the issue, I found a Reddit thread discussing similar problems where users mentioned that certain bugs could be causing these types of errors. Checking for any app-wide issues might be helpful.

Could you try these steps and let me know how it goes?