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Remove key file restriction from Source Code Release
Yes, I understand what's happening there, and sorry to take so long to respond, btw. To resolve the problem:
Open the project properties page for the Rhyduino project (and any others with the same error).
Navigate to the Signing tab. Uncheck the "Sign the assembly" checkbox.
For the release version of Rhyduino (coming soon), I will remove this setting from the source code download packages.