How to fix this "failed load" problem?

FiveM Server Development Server Discussion
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Hello / Good evening, I have a little problem after putting esx_billing and esx_datastore he puts his

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you fix line 61 in esx_billing/server/main.lua

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and I have to correct what?

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attempt to index(read: use) a nil(read: non existent / missing) value (global "ESX")
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I replace in place of his? “ESX.RegisterServerCallback(‘esx_billing:getBills’, function(source, cb)”

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I don’t understand what I should put I’m starting in the dev