We are running VisualCron 10.0.1 and have been using a task that is supposed to decrypt PGP files. However, the process is not decrypting the files. I created a separate, manual task and receive the error stated above.

How do I resolve the issue such that the PGP Decrypt finishes to completion?

What that suggests to me is that the encrypted message does not have any PGP key that has been added to the Visualcron PGP keyring as a recipient. Maybe use the PGP command line to check the key IDs the files are encrypted for, and make sure one matches a key or subkey ID in the Visualcron key ring you have selected in the Decrypt settings. I've definitely had to deal before with counterparties not encrypting things for the key I asked them to.