ahh. it was a syntax error.
I update ionic yesterday and, i started to get this kind of errors
Unhandled Promise rejection: Template parse errors: Can't bind to 'ngForIn' since it isn't a known property of 'ion-card'. 1. If 'ion-card' is an Angular component and it has 'ngForIn' input, then verify that it is part of this module. 2. If 'ion-card' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" to the '@NgModule.schema' of this component to suppress this message.
ion-card & ion-list with *ngFor produce this errors.
I re-installed ionic but still getting this error.
Please help me .