Hi there. I'm getting this error with flex-layout@latest - ^2.0.0-beta.10-4905443 as well as attempting to update to "@angular/flex-layout": "git+https://github.com/angular/flex-layout-builds.git"
I downgraded my version of rsjx to an earlier build hower this breaks the rest of my @angular v5 build.
The latest version of Angular/rsjx simply doesn't have an operators.js file
This is a System..js build if that helps.

rxjs/operators was added in a recent version of rxjs so this error is likely from downgrading rxjs.
Flex-Layout requires "rxjs": "^5.5.0" [see package.json] for the following imports to work:
import {map, filter} from 'rxjs/operators';
Will not fix.
Reopening to address some outlier issues related to lettable operators.
Fixed with today's 2.0.0-beta.12 release. See SHA 62457a5972
I am getting the same issue with rxjs version 6.1.0 with angular 6
Hello!, Work around on https://github.com/ReactiveX/rxjs/issues/2971, regards
Should probably be fixed by #751
Fixed SHA ffb5c79be63ccc8d2d08003ca531e99d25a5cf75
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I am getting the same issue with rxjs version 6.1.0 with angular 6