Issue with package workmanager flutter

This error occurs when there is a mismatch between the expected method or configuration and whats actually implemented or configd in code.

Some steps that can help your problem get resolved:

1. Update the package by running flutter pub upgrade workmanager

2. Check configuration

3. Permission: Ensure that flutter has necessary permissions to execute background tasks

4. Clen and rebuild you flutter by following commands. flutter clean, flutter pub get and flutter run

5. Check for typos and imports

6. Check for platform specific code

The workmanager package is subject to updates and changes so refer to the package's documentation.

Now, In the project.pbxproj filelocate the system capabilities section that would look like this

/* Begin PBXProject section */

...

/* End PBXProject section */

Here you can add system capabilities like you want to enable the background fetch capability then you would add something like this:

SystemCapabilities = {
   com.apple.BackgroundModes = {
      enabled = 1;
      items = (
         {
            enabled = 1;
            value = backgroundFetch;
         },
      );
   };
};

now modify the com.apple.BackgroundModes key to match the specific capability you want to enable or say configure. Configure in Xcode and Build and Run again!

Thanks