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Error Message should display while package is installing from appexchange.

Hi All,


I  have a problem with installing the packages. If the users want to install my package from appexchange, they need to install one more managed package before that.


If the users forgot this and tried to install my package and login to the application and follow the installation steps, finally they got the error messages like missing some packages into the system. 


I need this type of custom message while login to the user's credentials itself. Can I know how to do this.



Thanks in Advance.



Shoby Abdi.ax910Shoby Abdi.ax910

What is the package that is being installed from the AppExchange? Is it a public or private package? Are you indicating in your listing that there is a package dependency that they must first fulfill? 


Yes,this is a public package and in the listing i have already mentioned to install another app first.