MatPaginator.html gives TypeError: Cannot read property 'subscribe' of undefined

Bug, feature request, or proposal:

Bug

What is the expected behavior?

No Errors

What is the current behavior?

Currently while using Material Table <table mat-table #sort="matSort" [dataSource]="dataSource" matSort matSortDisableClear></table>

What are the steps to reproduce?

https://stackblitz.com/edit/angular-va2xwy?file=src%2Fapp%2Fapp.component.ts

What is the use-case or motivation for changing an existing behavior?

The error i get is the same but it also points me to MatPaginator.html. Below is the exact error that i face. MatPaginator.html:1 ERROR TypeError: Cannot read property 'subscribe' of undefined at Observable.push../node_modules/rxjs/_esm5/Observable.js.Observable._subscribe (Observable.js:231) at Observable.push../node_modules/rxjs/_esm5/Observable.js.Observable._trySubscribe (Observable.js:172) at Observable.push../node_modules/rxjs/_esm5/Observable.js.Observable.subscribe (Observable.js:160)

I face the same issue while using other material elements and those sometimes break. I believe these issues are related and just a configuration change or a package version change would solve it for us.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular CLI: 6.1.5 Node: 8.11.3 OS: win32 x64 Angular: 6.1.6 … animations, common, compiler, compiler-cli, core, forms … http, platform-browser, platform-browser-dynamic, router

Package Version

@angular-devkit/architect 0.7.5 @angular-devkit/build-angular 0.7.5 @angular-devkit/build-optimizer 0.7.5 @angular-devkit/build-webpack 0.7.5 @angular-devkit/core 0.7.5 @angular-devkit/schematics 0.7.5 @angular/cdk 6.4.7 @angular/cli 6.1.5 @angular/material 6.4.7 @ngtools/webpack 6.1.5 @schematics/angular 0.7.5 @schematics/update 0.7.5 rxjs 5.6.0-forward-compat.5 typescript 2.9.2 webpack 4.9.2

Is there anything else we should know?

I searched a lot but could not find a solution to my problem. If you have any resources that would help me fix my issue then please point me towards it

[josephperrott]

Closing as it seems that the issue you was caused by a mismatch in the versions of angular’s platform packages being used.

@angular/forms was at 6.0.0 while other @angular platform packages were 6.1.7, upon moving @angular/forms to 6.1.7 everything works as expected.

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