'Insecure content requested' error when implementing Google Play services

[A.P.]

I have added the Google play services library into my project and I am trying to display admob ads. When running the project from Eclipse, it works fine and ads appear. When I sign the project and install the apk on the same device, I get no ads and I get the following errors on LogCat:

06-02 19:46:33.255: W/Ads(5641): JS: The page at about:blank displayed insecure content from gmsg://mobileads.google.com/loadAdURL?drt_include=1&request_scenario=online_request&type=gwhirl&url=http%3A%2F%2Fgoogleads.g.doubleclick.net%3A80%2Fmads%2Fmediate%3Fsession_id%3D9004998229673146002%26seq_num%3D1%26slotname%3D0e3c34db9b3b4d05%26rm%3D2%26js%3Dafma-sdk-a-v4452000.4030500.1%26eid%3D46621036%26hl%3Den%26smart_w%3Dfull%26gnt%3D3%26ma%3D0%26carrier%3D28001%26u_sd%3D2%26sp%3D0%26cnt%3D1%26muv%3D15%26riv%3D6%26ms%3DQeIuMdQnKslgHCPQd_GUSlkC3IpSSd-pjvLwPET-IontNhOk9ZE_e6Ys7yvZEO5z3EbW7JS9pJQOCRjaG3bWL4Q7zP6qYMVaq6zRN9naMzL-AUU79NGzDnPIPc4NNNgp1ewKpFo8HKuwe3VZ3rk0FjVfBucfCzJMVmvjLPRebXO3JzSl8Xp1XuRPhcfuO_2UWttwvxZLUUlB_AogxKqVXDGdL7jX8KK_FBXeDrgLvC68YZGChj_ch3E7b8khixBgwTHVWVow_xMhp09uMKPXdXNL29J-JBELkmnudgp5pvJiMuN2CT13pN4SOZFrgWAvtzgGKNpbqaZGV1WloQcg6A%26mv%3D80260017.com.android.vending%26format%3D360x50_as%26smart_h%3Dauto%26coh%3D1%26gl%3DUS%26am%3D0%26u_w%3D360%26u_h%3D640%26msid%3Dcom.testads.test%26app_name%3D67.android.com.testads.test%26an%3D67.android.com.testads.test%26net%3Dwi%26u_audio%3D1%26u_so%3Dp%26preqs%3D0%26pimp%3D0%26pclick%3D0%26basets%3D1947676%26currts%3D1947676%26output%3Dhtml%26region%3Dmobile_app%26u_tz%3D180%26client_sdk%3D1%26ex%3D1%26gsb%3Dwi%26caps%3DinlineVideo_interactiveVideo_mraid1_th_autoplay_mediation_av_sdkAdmobApiForAds_di%26jsv%3D91%26urll%3D1055&base_uri=http%3A%2F%2Fgoogleads.g.doubleclick.net%3A80%2Fmads%2Fmediate&use_webview_loadurl=0&google.afma.Notify_dt=1401727593241.

Does someone know what this is about?

[A.P.]

Found the problem. Ir seems like there was something wrong in the proguard file. Deleted it and used a new one with default settings and the problem is gone now.