Created Unassigned: How to install nuget package to WP8.1? [10235]

Hi,

Attempting to resolve dependency 'OxyPlot.Core (≥ 2014.1.319.1)'.
'OxyPlot.Core 2014.1.319.1' already installed.
Installing 'OxyPlot.WP8 2014.1.319.1'.
Successfully installed 'OxyPlot.WP8 2014.1.319.1'.
Adding 'OxyPlot.Core 2014.1.319.1' to ProjectName.
Install failed. Rolling back...
Could not install package 'OxyPlot.Core 2014.1.319.1'. 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.

Any advice how to solve this?

Thx,
PV