"Encountered error while building for device."

[athilams]

I'm trying to build for iOS release, but I got this error, and couldn't find a solution anywhere. I couldn't even find some similar error.

Xcode build done. 4,3s
Failed to build iOS app
Error output from Xcode build:
↳
** BUILD FAILED **

Xcode's output:
↳
/Users/Dev/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/speech_recognition-0.3.0+1/ios/Classes/SwiftSpeechRecognitionPlugin.swift:71:13: error: editor placeholder in source file
<#fatalError()#>
^
Command CompileSwift failed with a nonzero exit code
note: Using new build system
note: Planning build
note: Constructing build description

Encountered error while building for device.

[liemvo]

Can you try to set the swift language to 4.2?