Virtual scroll

this is the error it throw:

Can't bind to 'virtualItem' since it isn't a known property of 'ion-item'.
1. If 'ion-item' is an Angular component and it has 'virtualItem' input, then verify that it is part of this module.
2. If 'ion-item' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. ("virtualScroll]="properties" approxItemHeight="50px"

It seems that it doenst recongnize ion item