Looks like you're not following the testing environment setup, try accessing http://localhost:9999/integrationExamples/gpt/neuwoRtdProvider_example.html after running commands in the prebid.js source folder that includes libraries/modules/neuwoRtdProvider.js


                npm ci
                npm i -g gulp-cli
                gulp serve --modules=rtdModule,neuwoRtdProvider,appnexusBidAdapter

Add token and url to use for Neuwo extension configuration

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Basic Prebid.js Example using neuwoRtdProvider