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Add-on ...... is missing boostrap method install

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I am newbie in add-on. I can't install my add-on in firefox. I keep getting this error message and i don't understand it.I have try "npm install bootstrap" but it still getting error. Message: " 1520351771295 addons.xpi WARN Add-on @learn is missing bootstrap method install "

I am newbie in add-on. I can't install my add-on in firefox. I keep getting this error message and i don't understand it.I have try "npm install bootstrap" but it still getting error. Message: " 1520351771295 addons.xpi WARN Add-on @learn is missing bootstrap method install "

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chounry said

I am newbie in add-on. I can't install my add-on in firefox. I keep getting this error message and i don't understand it.I have tried "npm install bootstrap" but it still getting error. Message: " 1520351771295 addons.xpi WARN Add-on @learn is missing bootstrap method install "
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chounry said

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This is just a warning, not an error. I'm pretty sure that this warning can't stop the installation of your add-on.