Thank you for providing the repro project. There were two things in the project that could cause this:
1 - The Forms project was a PCL, this is a deprecated project type. All Xamarin.Forms apps (v3.x or later) should be using .NET Standard 2.0
Note: As I mentioned in our support ticket, the Telerik project template still uses a PCL, which is an error on our part. We needed to update this to .NET Standard 2.0 for our 2018 R3 release. This is going to be fixed in the next release.
2 - There was some ambiguity because the Telerik assemblies were still in the project and there were some NuGet references and local assembly references. A duplicate assembly reference will provide duplicate namespaces and cause such an error.
Here is how you should create a new project until we update the project template for Mac
1- Use the default Xamarin.Forms project template to create a new project
2 - Add the Telerik to the solution by installing the Telerik.UI.for.Xamarin
NuGet package to each project in the solution.
I have gone ahead and done this for you and copied over the content in your original project. Find it attached. Here's a screenshot at runtime:
Before I conclude, I wanted to share a tip when it comes to zipping up your project to be shared. You can delete all the bin, obj
(and if your project has one, the Packages)
folder from every project in the solution. This is because Visual Studio will create and restores these folders when you do a rebuild.
By removing these autogenerated folders, you reduce the ZIP size from hundreds of MBs down to just a few MB! For example, your project ZIP was 621 MB, while mine is now only 1 MB!
I hope this is helpful, if you have any future trouble, please open a support ticket
so we can investigate directly (you can attach a ZIP to a support ticket).
Lance | Tech Support Engineer, Sr.
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