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Uncaught MissingPluginException after deploying web version #92

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tejHackerDEV opened this issue Oct 4, 2022 · 11 comments
Open

Uncaught MissingPluginException after deploying web version #92

tejHackerDEV opened this issue Oct 4, 2022 · 11 comments

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@tejHackerDEV
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Hi guys, I was using mixpanel in flutter web. When I am testing it in local, it is working fine but when I deployed it on firebase hosting, it started throwing error on Mixpanel.init() with the error "Uncaught MissingPluginException(No implementation found for method initialize on channel mixpanel_flutter)" & causing the app not be load. So please check this as it is blocking our release.
@petrol-mallik petrol-mallik mentioned this issue Oct 11, 2022
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@LOCKEDFILE
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LOCKEDFILE commented Dec 26, 2022 •
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Check your code in index.html

<head>
    // ~~~
    <script src="flutter.js" defer></script>
    <script src="./assets/packages/mixpanel_flutter/assets/mixpanel.js"></script>
</head>

It should be written END LINE OF HEAD.

@DamDam98
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I am having the same issue. My script tag is in the correct place in index.html

the package is working fine locally (in debug)

But when I deploy using firebase hosting it is throwing this error:
Uncaught MissingPluginException(No implementation found for method initialize on channel mixpanel_flutter)

@jemutorres
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jemutorres commented Jun 16, 2023 •
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I am having this same problem in Flutter 3.10.2 with version 2.1.1.

In local environment it works correctly, but when deploying on Google App Engine the same error occurs: Uncaught MissingPluginException(No implementation found for method initialize on channel mixpanel_flutter)

pubspec.yaml:
mixpanel_flutter: ^2.1.1 # https://pub.dev/packages/mixpanel_flutter

index.html (at the end):

<head>
   ...
  <script src="./assets/packages/mixpanel_flutter/assets/mixpanel.js"></script>
</head>

@jomonson
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For me the error was: PlatformException: Cannot read properties of undefined (reading 'init'), null, null).
Adding this to index.html fix the issue for both release and debug builds:

<head>
   ...
  <script src="./assets/packages/mixpanel_flutter/assets/mixpanel.js"></script>
</head>

@Hannnes1
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Hannnes1 commented Jul 5, 2023 •
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PlatformException: Cannot read properties of undefined (reading 'init'), null, null) is caused by a missing script tag, but MissingPluginException(No implementation found for method initialize on channel mixpanel_flutter) occurs even with the tag in place.

#91 suggests that the error occurs due to ad blockers, but I have the same issue even if all ad blockers are disabled and all calls to the mixpanel CDN returns 200. Both in chrome and firefox.

@devr-tech
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Any updates on this issue as I am currently facing the similar issue after deployed to Firebase Hosting.

@btribouillet
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Still having the issue in production, also on firebase hosting.

I did add <script src="./assets/packages/mixpanel_flutter/assets/mixpanel.js"></script>

@arpit24sahu
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arpit24sahu commented Mar 12, 2024 •
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Still facing this issue. Is there any plan to fix it as it has been in "Open" state for long.

@tejHackerDEV What did you use to get rid of this issue? Did you use some other package?

@Abdullah-Uppal
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What worked for me!!

flutter clean
flutter pub get

and then build

@pawelskinbrilla
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Hi there, I have the same issues. Please do something about it.

@vendoshi
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vendoshi commented Sep 11, 2024 •
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I had the same issue. The reason for me was using adblocker. Mixpanel is a tracker so it was blocked.

Screenshot 2024-09-11 at 6 18 12 PM

Just add a try catch block in the init function.. it should be fine.

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