NG0200: Circular dependency in DI detected while instantiating a provider
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Converting circular structure to JSON –> starting at object with constructor ‘Subscriber’ |Â Â Â Â property ‘_subscriptions’ -> object with constructor ‘Array’ |Â Â Â Â index 0 -> object with constructor ‘SubjectSubscription’ — property ‘_parentOrParents’ closes the circle at JSON.stringify (<anonymous>)
Error: export ‘MatButtonModule’ (imported as ‘MatButtonModule’) was not found in ‘@angular/material’ (possible exports: ɵɵtsModuleIndicatorApiExtractorWorkaround)