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It looks like you're encountering a code signing error on macOS High Sierra when trying to validate a plugin in Logic Pro. This error is related to the codesign utility not being able to process the file due to issues with the file's structure or the codesign_allocate tool.

Here's a step-by-step approach to troubleshoot and resolve this issue:

1. Update Command Line Tools
Ensure you have the latest version of Xcode Command Line Tools installed. Open Terminal and run:

xcode-select --install


If you already have the Command Line Tools installed, you might want to reinstall them to ensure there are no issues:

sudo rm -rf /Library/Developer/CommandLineTools
xcode-select --install

2. Verify codesign_allocate Tool
Make sure that codesign_allocate is correctly installed and accessible. You can verify its location by running:
which codesign_allocate

It should return a path like /usr/bin/codesign_allocate. If not, you may need to reinstall the Command Line Tools as mentioned above.

3. Check and Repair the Plugin
Sometimes the plugin file may be corrupted or not correctly formatted. You can try re-downloading or reinstalling the plugin.

4. Manually Sign the Plugin
If the issue persists, you might need to manually sign the plugin. First, create a self-signed certificate if you don't already have one:

sudo security create-keychain -p <password> build.keychain
sudo security import /path/to/your/certificate.p12 -k build.keychain -P <certificate password> -T /usr/bin/codesign

Then, use codesign to sign the plugin:
codesign -s "Your Certificate Name" /Library/Audio/Plug-Ins/Components/MF-101S.component

5. Fix File Order
The error message indicates that the file is not in the correct order. To attempt to fix this, you can use lipo to extract and recombine the architectures (assuming it's a universal binary with multiple architectures):

lipo -thin x86_64 /Library/Audio/Plug-Ins/Components/MF-101S.component/Contents/MacOS/MF-101S -output /Library/Audio/Plug-Ins/Components/MF-101S.component/Contents/MacOS/MF-101S.x86_64
mv /Library/Audio/Plug-Ins/Components/MF-101S.component/Contents/MacOS/MF-101S.x86_64 /Library/Audio/Plug-Ins/Components/MF-101S.component/Contents/MacOS/MF-101S

This process extracts the x86_64 architecture and then replaces the original file.

6. Validate the Plugin in Logic Pro
Finally, try validating the plugin again in Logic Pro. Open Logic Pro and go to the Plugin Manager to re-scan the audio unit.

Summary
Update Command Line Tools: Ensure you have the latest tools installed.
Verify codesign_allocate: Check its accessibility and path.
Check and Repair Plugin: Re-download or reinstall the plugin.
Manually Sign the Plugin: Use codesign to sign the plugin.
Fix File Order: Use lipo to extract and recombine architectures if necessary.
Validate in Logic Pro: Re-scan the plugin in Logic Pro.
If these steps do not resolve the issue, you may need to contact the plugin manufacturer for further assistance or check if there are any specific updates or patches for macOS High Sierra compatibility.