Issue with Custom exception in Production mode

I have defined custom exception  extending from Exception class. On server I throws this custom exception with some message.
My RPC call also has this exception  as part of service call signature. In development mode when I show this message  in "onFailaure()" method of RPC call on client,
I see proper message. But in production (after compilation)  , on client I see 500 error instead of message.

Any idea could be the reason and how to resolve this?

Thanks ,

Nagin kothari

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