Unfortunately, I am getting similar error:
user@DESKTOP-BD6HS68 MINGW64 ~/Desktop/SymbolTest/special-chars
$ rush build
__
_______ _______/ /_
/ ___/ / / / ___/ __ \
/ / / /_/ (__ / / / /
/_/ \__,_/____/_/ /_/
• Build initialized
┌ Checking project files
│
│ OK Metadata file (rush.yml) found
│
│ OK AndroidManifest.xml file found
└ Done
Unhandled exception:
type 'Null' is not a subtype of type 'DateTime'
#0 BuildCommand.run (package:rush_cli/commands/build_command/build_command.dart:182)
<asynchronous suspension>
#1 CommandRunner.runCommand (package:args/command_runner.dart:196)
<asynchronous suspension>
user@DESKTOP-BD6HS68 MINGW64 ~/Desktop/SymbolTest/special-chars
$
AndroidManifest.xml file found
└ Done
Unhandled exception:
type 'Null' is not a subtype of type 'DateTime'
#0 BuildCommand.run (package:rush_cli/commands/build_command/build_command.dart:182)
<asynchronous suspension>
#1 CommandRunner.runCommand (package:args/command_runner.dart:196)
<asynchronous suspension>
user@DESKTOP-BD6HS68 MINGW64 ~/Desktop/SymbolTest/special-chars
$ ^C
user@DESKTOP-BD6HS68 MINGW64 ~/Desktop/SymbolTest/special-chars
$
I am facing it now. I had built it previously and it worked twice for sure