Async Procedures extension does not work

Hello, I am using in my app Async Procedures extension of Abhijith_Dominic, but it seems not working well, I get the errors in the below attached pictures.
My suspect is this extension is not somehow compatible with other extensions: my asynchronously called procedure invokes indeed another extension to decode and display a picture incoming from Bluetooth connection as string Base64 encoded (see the last picture here attached). I remark that non-asynchronous version of my app runs fine.
Unfortunately, the topic about Async Procedures extension (Async Procedures | Extension | Free) has been closed, therefore I am going to open another topic to get help. A feedback from anybody, in particular from the extension author would be very appreciated.

Thanks all in advance.

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5 posts were merged into an existing topic: Async Procedures | Extension | Free