Class AMSupportURLConnectionDelegate is implemented in both

try a simple, documented step first

In Terminal:

sudo xcode-select -r

explanation

The command resets xcode to the default path (see documentation excerpt below). This command

• resolved the issue for me and
• avoided the risk of introducing random, undocumented ideas from strangers.

These advantages make it worth trying first, especially since documented approaches typically won't interfere with future version upgrades. Experimental workarounds may need to be undone first.

documentation

% xcode-select -h
Usage: xcode-select [options]

Print or change the path to the active developer directory. This directory
controls which tools are used for the Xcode command line tools (for example, 
xcodebuild) as well as the BSD development commands (such as cc and make).

Options:
  -h, --help                  print this help message and exit
[...]
  -r, --reset                 reset to the default command line tools path

I had the same issue. I saw the same error when I ran flutter build ios.

The error message was displayed red color on my VS code terminal, but it was kind of misleading. I found it was not the main issue.

The actual issue should be on the following error section.

So, please run flutter build ios --verbose and read the output carefully.

In my situation, there were other issues of the failure of flutter build ios. The issues were like forget to put in GoogleService-Info.plist or iOS target version is less than the requirement of flutter packages.

installing ffi helped me. I was stucked from last two days and then I finally found this solution.

arch -x86_64 sudo gem install ffi use this if you are using m1

sudo gem install ffi if you are intel Macs

Thanks Hope this will work.

Got the same error, also on an M1 macbook. Fixed it by:

1. flutter clean inside the project directory.
2. flutter build ios
3. 'Start debugging' (vs code).

I replaced all /app/ios files with new from fresh application created by flutter create