در زمان افزودن reference جدید به xamarin با خطا مواجه شدیم

باید از روش زیر عمل کنید.مثلا زمان افزودن cardview

 

It sounds like you might have a corrupt download. Please try deleting the zips folder  inside C:UsersusernameAppDataLocalXamarin.

Then, delete the  obj/ folder  from your solution's project folders, restart Xamarin Studio, and rebuild.

 

error that can happen ...

Error 11 Please install package: 'Android Support Library' available in SDK installer. Android resource directory C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3embedded./ doesn't exist. MyProject.Droid
Error 5 Please install package: 'Android Support Library' available in SDK installer. Java library file C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3embeddedclasses.jar doesn't exist. MyProject.Droid
Error 8 Please install package: 'Android Support Library' available in SDK installer. Java library file C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3embeddedlibs/internal_impl-21.0.3.jar doesn't exist. MyProject.Droid
Error 4 Reason: C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3android_m2repository_r10.zip is not a valid zip file MyProject.Droid
Error 7 Reason: C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3android_m2repository_r10.zip is not a valid zip file MyProject.Droid
Error 10 Reason: C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3android_m2repository_r10.zip is not a valid zip file MyProject.Droid
Error 3 Unzipping failed. Please download https://dl-ssl.google.com/android/repository/android_m2repository_r10.zip and extract it to the C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3content directory. MyProject.Droid
Error 6 Unzipping failed. Please download https://dl-ssl.google.com/android/repository/android_m2repository_r10.zip and extract it to the C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3content directory. MyProject.Droid
Error 9 Unzipping failed. Please download https://dl-ssl.google.com/android/repository/android_m2repository_r10.zip and extract it to the C:UsersdevAppDataLocalXamarinAndroid.Support.v421.0.3content directory. MyProject.Droid

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