Unable to install the library

[alaeschaik]

I am currently working on a Windows Phone 8.1 app.
When I try to install the library it gives me the following error code:

Severity Code Description Project File Line Suppression State
Error Could not install package 'MixERP.Net.VCards 1.0.7'. You are trying to install this package into a project that targets 'WindowsPhoneApp,Version=v8.1', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author. 0

Can I change the target?
Can anyone help me to resolve this issue I'm new to .NET