This is not so much a question but rather a quick solution for this (somewhat frequent) problem:
#1 - open Terminal.app
#2 - Copy/paste
sudo update_dyld_shared_cache -force
#3 - it should take 1-2 minutes.
It worked for me.
MacBook Pro with Retina display, macOS High Sierra (10.13.6)
it didn't find some paths : (
...
update_dyld_shared_cache: warning: i386 adding dependents to /System/Library/PrivateFrameworks/Assistant.framework/Versions/A/Resources/Assi stant Plugin.ibplugin/Contents/MacOS/Assistant Plugin: required dylib '@rpath/InterfaceBuilderKit.framework/Versions/A/InterfaceBuilderKit' not found, needed by '/System/Library/PrivateFrameworks/Assistant.framework/Versions/A/Resources/*** istant Plugin.ibplugin/Contents/MacOS/Assistant Plugin'
update_dyld_shared_cache: warning: x86_64h adding dependents to /System/Library/BridgeSupport/ruby-2.3/bridgesupportparser.bundle: required dylib '@rpath/libclang.dylib' not found, needed by '/System/Library/BridgeSupport/ruby-2.3/bridgesupportparser.bundle'
update_dyld_shared_cache: warning: x86_64h adding dependents to /System/Library/PrivateFrameworks/Assistant.framework/Versions/A/Resources/Assi stant Plugin.ibplugin/Contents/MacOS/Assistant Plugin: required dylib '@rpath/InterfaceBuilderKit.framework/Versions/A/InterfaceBuilderKit' not found, needed by '/System/Library/PrivateFrameworks/Assistant.framework/Versions/A/Resources/*** istant Plugin.ibplugin/Contents/MacOS/Assistant Plugin'
update_dyld_shared_cache: warning: x86_64h adding dependents to /System/Library/QuickLook/Audio.qlgenerator/Contents/MacOS/Audio: required dylib '/Library/Frameworks/iTunesLibrary.framework/Versions/A/iTunesLibrary' not found, needed by '/System/Library/QuickLook/Audio.qlgenerator/Contents/MacOS/Audio'
yep, I also got a few messages like that but it worked for me.
quick fix for Quicklook not previewing files
