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not able to connect USB to Serial Adapter

Hi Everyone, I am using uVision3 for Silicon Lab C8051F020 Microcontroller. As My laptop doesn't have Serial port, I am using an USB to Serial Adapter.
When I am trying to connect/debug, it is showing
"***Error: C:\Keil\C51\Bin\SiC8051F.Dll" invalid debug Dll.

Also, when I am opening uVision3 Debug settings in "Configure Flash Tools" menu, I am not able to select the "USB Debug adapter" option.

Can anyone please let me know, how to fix this?

Thanks and Regards
Rajesh

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