Bluetooth error 507

I'm trying to connect my Xperia P to arduino via Bluetooth (HC-05). But when I select my HC-05 device I get a "507 Unable to connect" error.

I have thought i made a mistake but i checked everything and i think my code is ok, and it is very simple (it is attached in this post).

If I'm using other apps on google store i can connect to my device, so it is working

Is there something i have to know with compatibility or else?

Now I'm using an Xperia P with Android 4.1.2.

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see this screenshot about how to connect correctly

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Thank you for your answer but this is not useful for my problem. I still have this issue.

I want to know if this is a bug of App Inventor  or if I'm usning it in a wrong way.

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well, first of all you should connect correctly...

and if you still get error 507, just try again or do a test using another device

see also these threads: search results for bluetooth 507

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I'm trying in every possible way. I'm using another app called ArduDroid and with it i can connect easily. So i don't think my cell is not able to connect, i think i have a problem with the app.

I'm following your instructions and i have read all those thread on your link but it still not works.

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THE SAME HAPPENS TO ME. WHY ?????

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I can't understand what you mean. Where is the problem, please?

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