File Writer Output to GroundPlex

I am suddenly unable to write a file on my groundplex; has anyone see this before? Just a straight write, e.g., “file:///Users/rwhite/Development/test.json”. Oddly, I can read that exact file and location. The error I get follows as well some groundplex information (I have already tried restarting it). Kindly let me know if you have any suggestions.

Failure: Failed to write to file:///Users/rwhite/Development/test.json, Reason: Possible reasons can be failure in URL connection or file access denial, detail: \Users\rwhite\Development\test.json (The system cannot find the file specified), Resolution: Address the reported issue.