This was an error seen on the Tiled server when we tried to read a file from Tiled, both on the Tiled interface and with a script that reads directly from Tiled. We were able to read from Tiled without issues in the week prior but had trouble the following week:

The error was not seen before with Tiled, by anyone in our group. The catalogs were not moved, but I have suspicion that maybe the data might have been moved or renamed after the catalog creation. Re-cataloging the databases still showed the same error. Deleting the catalogs and re-cataloging again allowed Tiled to run as expected.
This error could not be replicated. But this was something we encountered during setup process.