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Flutter – Error: The getter 'backgroundColor' isn't defined for the class 'ThemeData'

I want to run one of my old projects and while running I’m getting this error:

Error: The getter ‘backgroundColor’ isn’t defined for the class ‘ThemeData’.

  • ‘ThemeData’ is from ‘package:flutter/src/material/theme_data.dart’ (‘/C:/Android/flutter/packages/flutter/lib/src/material/theme_data.dart’).
    Try correcting the name to the name of an existing getter, or defining a getter or field named ‘backgroundColor’.
    TextStyle(color: confirmTextColor ?? theme.backgroundColor),
    ^^^^^^^^^^^^^^^

Target kernel_snapshot failed: Exception

FAILURE: Build failed with an exception.

Where:
Script ‘C:Androidflutterpackagesflutter_toolsgradlesrcmaingroovyflutter.groovy’ line: 1629

What went wrong:
Execution failed for task ‘:app:compileFlutterBuildDebug’.
Process ‘command ‘C:Androidflutterbinflutter.bat” finished with non-zero exit value 1

Try:
Run with –stacktrace option to get the stack trace.
Run with –info or –debug option to get more log output.
Run with –scan to get full insights.

Get more help at https://help.gradle.org

BUILD FAILED in 6s
Error: Gradle task assembleDebug failed with exit code 1

I already tried to find where is that backgroundColor in 'package:flutter/src/material/theme_data.dart' but nothing in it. I didn’t find backgroundColor in whole theme_data.dart file.

How to solve this?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    Okay I have solved this error, the error is coming from a package. I have used Get package in my old app which is outdated. I have just updated it,

    From

    get: ^4.6.5

    To

    get: ^4.6.6

  2. 0

    It looks like somewhere in your project you there is a

    TextStyle(color: confirmTextColor ?? theme.backgroundColor)

    You can’t use this theme.backgroundColor anymore. It looks like it might actually not be in your own code but in a package called flutter_tools. It seems this package hasn’t been updated for 4 years, and it’s now simply not compatible with the most recent flutter version anymore. The only way to get it to build again is to downgrade your flutter version, or to remove the flutter_tools package from your project.

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