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help(COMPONENT): error NG8001: 'mat-form-field' is not a known element · Issue #24015 · angular/components · GitHub
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mat-spinner don't show/hide inside when is a prefix or suffix of mat-form-field · Issue #10936 · angular/components · GitHub
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Angular Error NG8001: is not a known element Angular component, then verify part of this module - YouTube
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