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[Web] Stuck at "Attempting to connect to browser instance" #49103

@gisborne

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@gisborne

My web project compiles without error, but on launch, the browser opens with a blank page and Android Studio shows "Attempting to connect to browser instance" indefinitely.

Just ran Flutter upgrade now.

The console in the browser shows

Uncaught TypeError: Cannot read property 'core' of undefined
    at comparators.ddc.js:3
    at Object.execCb (require.js:1696)
    at Module.check (require.js:878)
    at Module.enable (require.js:1176)
    at Module.init (require.js:788)
    at callGetModule (require.js:1203)
    at Object.completeLoad (require.js:1590)
    at HTMLScriptElement.onScriptLoad (require.js:1717)
require.js:143 Uncaught TypeError: Cannot read property 'core' of undefined
    at utils.ddc.js:3
    at Object.execCb (require.js:1696)
    at Module.check (require.js:878)
    at Module.enable (require.js:1176)
    at Module.init (require.js:788)
    at callGetModule (require.js:1203)
    at Object.completeLoad (require.js:1590)
    at HTMLScriptElement.onScriptLoad (require.js:1717)
require.js:143 Uncaught TypeError: Cannot read property 'core' of undefined
    at typed_buffers.ddc.js:3
    at Object.execCb (require.js:1696)
    at Module.check (require.js:878)
    at Module.enable (require.js:1176)
    at Module.init (require.js:788)
    at callGetModule (require.js:1203)
    at Object.completeLoad (require.js:1590)
    at HTMLScriptElement.onScriptLoad (require.js:1717)
require.js:143 Uncaught TypeError: Cannot read property 'core' of undefined
    at hash.ddc.js:3
    at Object.execCb (require.js:1696)
    at Module.check (require.js:878)
    at Module.enable (require.js:1176)
    at Module.init (require.js:788)
    at callGetModule (require.js:1203)
    at Object.completeLoad (require.js:1590)
    at HTMLScriptElement.onScriptLoad (require.js:1717)

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    P2Important issues not at the top of the work listplatform-webWeb applications specificallyteam-webOwned by Web platform teamtoolAffects the "flutter" command-line tool. See also t: labels.triaged-webTriaged by Web platform team

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