Fail to connect the board in JAVA (Android)

As the title mentioned, I follow the website tutorial

https://mbientlab.com/tutorials/JaDevelopment.html
https://mbientlab.com/androiddocs/latest/metawearboard.html#unexpected-disconnects

but the method is not working

Code:

Log:

The log said that line 68 has an issue, but I cannot figure out what happen

Can anybody help me

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