Hi! I understand you're getting an access error with the NHK WORLD-JAPAN app on your Roku device. Let's work through this together.

To start, may I ask if you've tried any troubleshooting steps so far? For example, have you attempted to restart your Roku, update the app, or reinstall it? Also, are you seeing any specific error messages beyond "cannot access"? This info will help me guide you more precisely.

In the meantime, here are some simple steps that often resolve app access issues on Roku:

1. Restart Roku: Unplug your Roku device from power, wait about 30 seconds, and plug it back in. This refreshes the device system.

2. Update Software and Apps: Go to Settings > System > System update and check for any Roku software updates. Also, check that the NHK WORLD-JAPAN app itself is updated to the latest version.

3. Reinstall the NHK WORLD-JAPAN App: Remove the app from your Roku device, then add it back from the Roku Channel Store. Sometimes app data can get corrupted.

4. Check Network Connection: Ensure your Roku is connected to the internet properly. You can test the connection in Settings > Network.

5. Verify Regional Availability: NHK WORLD-JAPAN app availability might vary by location. Are you in a region where the app is officially supported?

If after these steps the error continues, there might be a temporary service issue or a more advanced configuration problem we can look into. Let me know what you have tried and what exact error message you see, and we’ll take it from there!