starting trouble

i require the plugin in js. then i wrote var printer = new Printer()
it says Printer is not a constructor....
solve this error please.............
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TypeError: Printer is not a constructor
File: "file:///data/data/org.nativescript.preview/files/app/views/shared/view-models/sub-product-view-model.js, line: 116, column: 18

StackTrace:
Frame: function:'SubProductListViewModel.viewModel.camera', file:'file:///data/data/org.nativescript.preview/files/app/views/shared/view-models/sub-product-view-model.js', line: 116, column: 19
Frame: function:'exports.camera', file:'file:///data/data/org.nativescript.preview/files/app/views/itemDetails/itemDetails.js', line: 30, column: 16
Frame: function:'Observable.notify', file:'file:///data/data/org.nativescript.preview/files/app/tns_modules/tns-core-modules/data/observable/observable.js', line: 110, column: 23
Frame: function:'Observable._emit', file:'file:///data/data/org.nativescript.preview/files/app/tns_modules/tns-core-modules/data/observable/observable.js', line: 127, column: 18
Frame: function:'ClickListenerImpl.onClick', file:'file:///data/data/org.nativescript.preview/files/app/tns_modules/tns-core-modules/ui/button/button.js', line: 26, column: 23

at com.tns.Runtime.callJSMethodNative(Native Method)
at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1101)
at com.tns.Runtime.callJSMethodImpl(Runtime.java:983)
at com.tns.Runtime.callJSMethod(Runtime.java:970)
at com.tns.Runtime.callJSMethod(Runtime.java:954)
at com.tns.Runtime.callJSMethod(Runtime.java:946)
at com.tns.gen.java.lang.Object_button_19_32_ClickListenerImpl.onClick(Object_button_19_32_ClickListenerImpl.java:17)
at android.view.View.performClick(View.java:5215)
at android.view.View$PerformClick.run(View.java:21193)
at android.os.Handler.handleCallback(Handler.java:742)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5571)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)

Start by reproducing the require and Printer construction at sub-product-view-model.js line 116, using the stack trace and the call from itemDetails.js line 30. Compare that usage with the plugin's documented entry point and Android behavior. Done means the constructor error no longer occurs during the camera flow; no test file or reproduction project is provided.

Written by the indexing model from the issue text.