You may see this error when uploading packages to Gemfury using cURL. This usually means a typo in your cURL command line options. You may have typed curl -F package=filename, in which case cURL sent the string “filename” as the value of “package”. Instead you want to prefix the filename with an @ to indicate that you would like the content of this file.

To correct this error, run:

curl -F package=@filename ...