Xamrin forms carousel view missing reference - xamarin.ios

I am using carousel view in xamarin forms to navigate through pages. After adding packages to my project's xamarin forms folder, I got an error "Cannot load file or assemble xamarin.forms.carouselview or one of its dependencies" I tried loading the assembly in appdelegate.cs. Now am getting a build error "Reference to type xamarin.forms.IItemViewController claims it is defined assembly xamarin.forms.core, version=1.5.0.0, culture=neutral, publickeytoken=null, but could be found" this error is pointing to the code of appdelegate that i have written.
I will be grateful if i get any suggetions
PS: this works perfect in a sample app. i am getting such error only when i am integrating this in my official project.

Xamarin Forms CarouselView has a dependency of Xamarin.Forms (>= 2.3.0.42-pre3)
You must upgrade to at least that version or higher. Your Xamarin.Forms.Core dll should then be version=2.0.0 instead of v1.5.0.

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https://i.stack.imgur.com/ezw6U.png
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