'md-card' is not a known element in material 2

In your src/app/modules/app-access.module.ts import the MdCardModule:

import { MdCardModule } from '@angular/material';

And add it in the imports:

imports: [ 
        ....
        MdCardModule, 
    ],

If you are using any other components from material 2, add those as well.

import { MatCardModule } from '@angular/material/card';

@NgModule({ ..
 imports: [..
MatCardModule]

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