Q&A: error while install module - Unable to install override

PrestaShop user question

Im trying to install Cart conditions pro module but i see error: The following(s) module(s) could not be installed correctly: cartcon, Unable to install override orderController, orderOpcController




PrestaShop expert answer

Hello,
this means that your shop already use some other plugin that uses override of order process

Its worth to explain what is override
PrestaShop enables you to override various default components and behaviors. This system consists of two major points but in this case we will focus on this one:
  1. Overriding PrestaShop's own behavior (class files and controller files) in order to target a specific section of the required components.


So, simply saying, another module that you previously installed applied an override of default component to handle order process.
Because of this you see "The following(s) module(s) could not be installed correctly: cartcon, Unable to install override orderController, orderOpcController".

In this case it is necessary to install second override manually (in fact we must merge two overrides)

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