betoxl / ngx.leaflet.offline Goto Github PK

Hey, I am trying to use this plugin in my Ionic-angular Application and I am doing all the things mentioned in the doc and example. But, I am getting the following error and the map is not showing.

ERROR Error: Uncaught (in promise): ReferenceError: L is not defined
ReferenceError: L is not defined
at MapDownloadComponent.createMap (map-download.component.ts:54:17)
at MapDownloadComponent. (map-download.component.ts:25:10)
at Generator.next ()
at tslib.es6.js:76:1
at new ZoneAwarePromise (zone.js:1340:1)
at __awaiter (tslib.es6.js:72:1)
at MapDownloadComponent.initMap (map-download.component.ts:23:16)
at MapDownloadComponent.ngOnInit (map-download.component.ts:20:10)
at callHook (core.mjs:2526:1)
at callHooks (core.mjs:2495:1)
at resolvePromise (zone.js:1255:1)
at new ZoneAwarePromise (zone.js:1343:1)
at __awaiter (tslib.es6.js:72:1)
at MapDownloadComponent.initMap (map-download.component.ts:23:16)
at MapDownloadComponent.ngOnInit (map-download.component.ts:20:10)
at callHook (core.mjs:2526:1)
at callHooks (core.mjs:2495:1)
at executeInitAndCheckHooks (core.mjs:2446:1)
at refreshView (core.mjs:9484:1)
at refreshEmbeddedViews (core.mjs:10594:1)

Any idea about what am I doing wrong?