Question: ModularSquareRoot Problem

Hello,
I am trying to write a program that will return a partial or complete list of points on an elliptic curve.
In order to do this using examples provided to me, the command "msqrt" was used, which would return FAIL if the conditions were not met.
However, as I am using Maple 2018, this was replcaed with "ModularSquareRoot" which returns an error message.
My question; Is there anyway to circumvent this error message, as it is really causing me a lot of headache. Thanks.

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