Angular 9 ng new myapp gives error The Schematic workflow failed

First ,verify your NPM cached memory

npm cache verify

then try :

npm cache clean --force
npm install –g @angular/cli@latest 
ng new <YourProjectName>

If the problem persists, then try the following

npm cache clean --force
npm update
ng new <YourProjectName>

NOTE

As @0210vidit said in the comment below:

do not use dash(-) or (.) in naming