Problem in flex-layout comes when ran ng serve

I found a solution if someone having the same problems IDK if its the best to resolve but for me this works:

    npm install @angular/[email protected] 

Inside your project: Remove/delete flex layout from your package.json then run:

npm update

followed by:

npm install @angular/flex-layout@latest --save

This is will automatically install the latest version of flex thats compatible with your angular material.