WDMCF is a mod that makes Minecraft always print the exception to the console when the message "An unexpected error occurred trying to execute that command" is sent to the client. This mod is intended to be used on development environments, you shouldn't install it on your normal client/server.
To add it to your development environment, add the following snippet to your build.gradle:
repositories {
maven {
url 'https://maven.bymartrixx.me'
}
}
dependencies {
modImplementation 'me.bymartrixx:wdmcf:1.0.2'
}