Hi everyboday. Error 515 Bluetooth device not connected!

I have done app the steps to create the app as in the link Below.
But the error that I receiver is 515 Not connected to Bluetooth device.

Is Something wrong here pt with the settings?

Can someone please give me an idea?

Thank you!

https://www.google.com/search?q=arduino+and+app+inventor&oq=&aqs=chrome.3.69i58j69i64j35i39i362i523l13.-1j0j4&client=ms-android-oppo-rvo3&sourceid=chrome-mobile&ie=UTF-8&chrome_dse_attribution=1#fpstate=ive&vld=cid:8958c1e3,vid:aQcJ4uHdQEA,st:0

Export your .aia file and upload it here.
export_and_upload_aia

Thank you very much for your answer.
I swiched two blocks and this was the issue.

Thank you! I appreciate!

can you say more?
also a screenshot of your relevant blocks could help others with similar issues in future

Taifun