Bug 58284 - Unable to add a reference to project (Targets are not the same or compatible)
Summary: Unable to add a reference to project (Targets are not the same or compatible)
Status: RESOLVED DUPLICATE of bug 52932
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 2.3.4
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2017-07-20 22:48 UTC by Derek Foulk
Modified: 2017-07-21 18:43 UTC (History)
2 users (show)

Tags: class library, pcl, profile
Is this bug a regression?: ---
Last known good build:

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Description Derek Foulk 2017-07-20 22:48:42 UTC
Hey dudes,

I'm trying to add a reference to our Xamarin.Forms PCL (App) project. The project I'm trying to reference is a Xamarin.Forms Class Library.

Steps to reproduce:

1) Open VS2017 v15.2 (26430.16) in Windows 10
2) Create a new 'Cross Platform App (Xamarin)' project (Blank/PCL)
3) Create a new 'Class Library (Xamarin.Forms)' project (in the same solution)
4) Open the 'Cross Platform App (Xamarin)' project
5) Try to add a reference to the 'Class Library (Xamarin.Forms)'

You will be greeted by an alert that says:

***Unable to add a reference to project 'MyClassLibrary'. The targets of Portable Library project 'MyClassLibrary' are not the same or compatible with the targets of the current Portable Library project.
A Portable Library project's targets can be changed via the Library tab in the project's properties.***

This error is caused by the fact that the two PCLs are created using different profiles...

'Class Library (Xamarin.Forms)' uses Profile111

'Cross Platform App (Xamarin)' (Blank/PCL) uses Profile259

Of course, we are unable to add 'Windows Phone Silverlight 8' (Thus converting Profile111 => Profile259) so... Yeah! The 'Class Library (Xamarin.Forms)' project is completely useless in the current version of VS2017.

Are there any workarounds that don't involve [this](https://www.danrigby.com/2014/04/10/windowsphone81-pcl-xamarin-fix/)?

Comment 1 Derek Foulk 2017-07-20 23:04:58 UTC
"Just remove 'Windows Phone Silverlight 8' from the 'Cross Platform App (Xamarin)' (Blank/PCL) targets (converting it from Profile259 => Profile111)"... You can't because Microsoft has removed Windows Phone 8 targets from the 'Change Targets' window ([see this thread](https://developercommunity.visualstudio.com/content/problem/18198/pcl-change-targets-window-and-add-portable-class-l.html#comment-20133)).
Comment 2 Brendan Zagaeski (Xamarin Team, assistant) 2017-07-21 00:05:46 UTC Comment hidden (obsolete)
Comment 3 Brendan Zagaeski (Xamarin Team, assistant) 2017-07-21 00:08:15 UTC
Correcting a typo to add the word "example" in Comment 2 (I will accordingly mark that comment as obsolete):

## Quick preliminary non-engineering team note about possible workarounds

> Are there any workarounds that don't involve...

One option is to open the .csproj file in a text editor [1] and change the `TargetFrameworkProfile` property to match the other PCL projects in the solution.

[1] (For example you can right-click the project in the Solution Explorer, select Unload Project, right-click the project again, and select Edit Project.)

## Cross-referencing note for the Xamarin team

The mismatch in PCL profiles between the 2 template projects is filed in Bug 52932, and a candidate fix for that issue (so that newly created projects will match each other as expected) is currently targeted for the upcoming "Xamarin 15.4 release" previews.
Comment 4 Derek Foulk 2017-07-21 00:11:19 UTC
I can confirm that manually editing the .CSPROJ file (for the Class Library) fixes the issue:

-    <TargetFrameworkProfile>Profile111</TargetFrameworkProfile>
+    <TargetFrameworkProfile>Profile259</TargetFrameworkProfile>

I can now add the reference. Much appreciated!
Comment 5 Jimmy [MSFT] 2017-07-21 15:54:47 UTC
As Brendan pointed out, this is an issue with the templates in Visual Studio and it has been fixed in a future release. In that case, I will mark this as a duplicate. Thanks!

*** This bug has been marked as a duplicate of bug 52932 ***
Comment 6 Derek Foulk 2017-07-21 18:43:19 UTC
Oops! I didn't see bug 52932 during my pre-post search. I guess I didn't realize what was causing the issue when I posted the bug... My bad! Thanks guys!