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Angular 2 - TypeError: Unable to read the "apply" property from undefined

I am developing a very simple Angular 2 application with one component, one service and one interface, but I encountered this error and after several hours of investigation I still can not find the answer.

Uncaught TypeError: Cannot read property 'apply' of undefined
    at XMLHttpRequest.desc.get [as ontimeout] (zone.js:1265)
    at XHRLocalObject.AbstractXHRObject._cleanup (abstract-xhr.js:149)
    at XMLHttpRequest.xhr.onreadystatechange (abstract-xhr.js:125)
    at XMLHttpRequest.wrapFn (zone.js:1230)
    at ZoneDelegate.invokeTask (zone.js:398)
    at Zone.runTask (zone.js:165)
    at XMLHttpRequest.ZoneTask.invoke (zone.js:460)

I can’t understand why the error continues to appear, the application still functions after the error appears, but it is frustrating.

Any ideas?

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2 answers

Hi, I had the same problem and I decided to downgrade this to zone.js@0.8.5 and the problem disappeared. Run the following command in the project folder:

npm install zone.js@0.8.5 --save
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- :

rimraf node_modules
npm cache clear
npm i zone.js@0.8.5
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Source: https://habr.com/ru/post/1016692/

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