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comments of
taiseen
in **Cart** component at line number 78, remove that **onClick=""**, then you don't get this error...
I'm not sure why it's happening at your end... so let's add some screen short here to see what is going on at your project?
Don't mind... I think you may have missed conception to understand this thing because that 2nd or 3rd item you **can't add** because they are already part of the 1st...