Unexpected token H in JSON at position 0

@plasticpaper wrote:

SyntaxError: Unexpected token H in JSON at position 0
at JSON.parse ()
at Response.Body.json (http://localhost:8100/build/vendor.js:66977:25)
at MapSubscriber.project (http://localhost:8100/build/main.js:81:56)
at MapSubscriber._next (http://localhost:8100/build/vendor.js:114082:35)
at MapSubscriber.Subscriber.next (http://localhost:8100/build/vendor.js:33093:18)
at XMLHttpRequest.onLoad (http://localhost:8100/build/vendor.js:67470:38)
at t.invokeTask (http://localhost:8100/build/polyfills.js:3:15660)
at Object.onInvokeTask (http://localhost:8100/build/vendor.js:4973:33)
at t.invokeTask (http://localhost:8100/build/polyfills.js:3:15581)
at r.runTask (http://localhost:8100/build/polyfills.js:3:10834)
Ionic Framework: 3.9.2

i don’t why this can be. i don’t change my backend code. Only change html code before i change my front end code my back end code passed as well. can you give me a solution?

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