Dynamo Sandbox Node Error

Hi,
I have downloaded the Dynamo Sandbox 2.17.0 and launched it using DynamoSamdbox.exe.
When I inserted below node a warning appeared at the top of node.

Please check the image -

image

Circle.ByCenterPointRadius operation failed
Could not load file or assembly (directory path where sandbox is unzipped) LtbG.ProtoInterface.dll’ or one of it’s dependencies. The system cannot find the file specified.

Much appreciated.
Balkrishna

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