"dumpsys window windows" error when assertions are getting enable

Hello, i’m working on a test project with Eclipse and Appium(1.4.16.1) Android Driver on Windows.
Before I enable assertions my project was running correctly.
But I enabled assertions by Run Configurations / Arguments / VM arguments / -ea on Eclipse.
Now, when I run my project the mobile application is opening then Appium logs consistently giving this error until I stop;

info: [debug] Getting focused package and activity

info: [debug] executing cmd: C:\Users\MyPC\AppData\Local\Android\sdk\platform-tools\adb.exe -s FA537YJ07557 shell “dumpsys window windows”
info: [debug] Getting focused package and activity
info: [debug] executing cmd: C:\Users\MyPC\AppData\Local\Android\sdk\platform-tools\adb.exe -s FA537YJ07557 shell “dumpsys window windows”
info: [debug] Getting focused package and activity
info: [debug] executing cmd: C:\Users\MyPC\AppData\Local\Android\sdk\platform-tools\adb.exe -s FA537YJ07557 shell “dumpsys window windows”
info: [debug] Getting focused package and activity
info: [debug] executing cmd: C:\Users\MyPC\AppData\Local\Android\sdk\platform-tools\adb.exe -s FA537YJ07557 shell “dumpsys window windows”
info: [debug] Getting focused package and activity
info: [debug] executing cmd: C:\Users\MyPC\AppData\Local\Android\sdk\platform-tools\adb.exe -s FA537YJ07557 shell “dumpsys window windows”

What is the source of this error and how can i solve this?