TastModule already loaded

Hello MDB-Team,

when using the latest version (4.3.1) of mdb pro, I get following error: (I integrated it in an existing project, following this guide: https://mdbootstrap.com/support/installing-mdb-angular-4-in-existing-angular-cli-project/)

Unhandled Promise rejection: ToastModule is already loaded. It should only be imported in your application\\\'s main module. ; Zone: angular ; Task: Promise.then ; Value: Error: ToastModule is already loaded. It should only be imported in your application\\\'s main module.

Imports in app.module:MDBBootstrapModule. forRoot()MDBBootstrapModulePro. forRoot()I also imported it in the module where I want to use it (but without forRoot()).When i don\\\'t import it in the this module, the components are not recognized.

There is no directive with \\\"exportAs\\\" set to \\\"mdb-modal\\\" (\\\"<div mdbModal [ERROR ->]#deleteDashboardModal=\\\"mdb-modal\\\" class=\\\"modal fade\\\" id=\\\"centralModalSuccess\\\" tabindex=\\\"-1\\\" role=\\\"dia\\\"): ng:///DashboardModule/DashboardComponent.html@100:14 ; Zone: angular ; Task: Promise.then ; Value: Error: Template parse errors:There is no directive with \\\"exportAs\\\" set to \\\"mdb-modal\\\" (\\\"</div>

What can I do about it? Is my installation wrong?