'Oracle apex older version Scan QR Code Plugin Not working

I am trying to use the plug in provided for QR Code scanner for lower version of oracle apex which is 20.1. When using same plugin with latest version (21.2 or 22.1) it works correctly. But when using same plugin with lower version it gives error.

Link is below: https://github.com/RonnyWeiss/APEX-QR-Code-Scanner

Same plugin with latest version Check latest version image here

Same plugin with lower version giving error Check lower version error image here

I want to use this plugin in to lower version of oracle apex. How can I do that?



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