inject() must be called from an injection context ?

[yonimoses]

Hi

Followed the install guide, and i'm getting this error.

"Error: inject() must be called from an injection context
    at injectInjectorOnly (http://localhost:4200/vendor.js:139697:15)
    at Module.ɵɵinject (http://localhost:4200/vendor.js:139707:61)
    at Object.**GuidedTourService_Factory** [as factory] (http://localhost:4200/vendor.js:18662:156)
    at R3Injector.hydrate (http://localhost:4200/vendor.js:204423:35)
    at R3Injector.get (http://localhost:4200/vendor.js:204242:33)
    at NgModuleRef.get (http://localhost:4200/vendor.js:214781:33)
    at Object.get (http://localhost:4200/vendor.js:214458:35)
    at lookupTokenUsingModuleInjector (http://localhost:4200/vendor.js:196337:39)
    at getOrCreateInjectable (http://localhost:4200/vendor.js:196449:12)
    at Module.ɵɵdirectiveInject (http://localhost:4200/vendor.js:207359:12)"

any suggestions?