Error while publishing to RStudio Connect Shiny dashboard

I can successfully run my app locally, but I get a strange error when I try to publish to my Connect dashboard. I was previously able to publish here. I need help determining what this error means, please:

----- Deployment error -----
Error in headers[[length(headers)]] :
attempt to select less than one element in integerOneIndex
Calls: ... httpInvokeRequest -> http -> -> grep -> parse_headers

----- Error stack trace -----
Error in headers[[length(headers)]] :
attempt to select less than one element in integerOneIndex
Calls: ... httpInvokeRequest -> http -> -> grep -> parse_headers
Error during wrapup: length(max.lines) <= 1 is not TRUE
Error: no more error handlers available (recursive errors?); invoking 'abort' restart
Execution halted

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