Could not find an option with short name "-r"

[mattmattox]

FormatException: Could not find an option with short name "-r". #0 Parser._validate (package:args/src/parser.dart:309) #1 Parser._handleAbbreviation (package:args/src/parser.dart:194) #2 Parser._parseAbbreviation (package:args/src/parser.dart:185) #3 Parser.parse (package:args/src/parser.dart:85) #4 ArgParser.parse (package:args/src/arg_parser.dart:335) #5 run (package:linkcheck/linkcheck.dart:206) #6 main. (file:///drone/src/src/bin/linkcheck.dart:11) #7 main. (file:///drone/src/src/bin/linkcheck.dart:9) #8 _rootRun (dart:async/zone.dart:1426) #9 _CustomZone.run (dart:async/zone.dart:1328) #10 _runZoned (dart:async/zone.dart:1861) #11 runZonedGuarded (dart:async/zone.dart:1849) #12 main (file:///drone/src/src/bin/linkcheck.dart:9) #13 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:295) #14 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192)