Qt Compile error from moc file, issue arising from changing name of a widget

Question

So I added a slider into a UI Form, and I clicked go to slot -> sliderReleased()..no problem there. BUT, then after having done that, I changed slider name from default of horizontalSlider to slider1 and deleted the old null implementation Qt had made. Now when I try to build my project I get this error:

C:\Qt\Qt5.1.1\Tools\QtCreator\bin\build-PROJECT_KART-Desktop_Qt_5_1_1_MinGW_32bit-
Debug\debug\moc_minigame2.cpp:94: error: undefined reference to 
`Minigame2::on_horizontalSlider_2_sliderReleased()'

So what, it thinks that slot should still be there? How do I fix this?