Unity 2018.3 issue!

Hi Guys When i updated y unity from 2018.2 TO 2018,3 I Got many errors i tried to fix the errors but i do not get it can you help me please? alt text

some of errors

Library\PackageCache\com.unity.postprocessing@2.0.15-preview\PostProcessing\Editor\Effects\AutoExposureEditor.cs(6,31): error CS0246: The type or namespace name 'AutoExposure' could not be found (are you missing a using directive or an assembly reference?)

(Filename: Library\PackageCache\com.unity.postprocessing@2.0.15-preview\PostProcessing\Editor\Effects\AutoExposureEditor.cs Line: 6)

Library\PackageCache\com.unity.postprocessing@2.0.15-preview\PostProcessing\Editor\Effects\ScreenSpaceReflectionsEditor.cs(14,9): error CS0246: The type or namespace name 'SerializedParameterOverride' could not be found (are you missing a using directive or an assembly reference?)

(Filename: Library\PackageCache\com.unity.postprocessing@2.0.15-preview\PostProcessing\Editor\Effects\ScreenSpaceReflectionsEditor.cs Line: 14)

Library\PackageCache\com.unity.postprocessing@2.0.15-preview\PostProcessing\Editor\Effects\ScreenSpaceReflectionsEditor.cs(15,9): error CS0246: The type or namespace name 'SerializedParameterOverride' could not be found (are you missing a using directive or an assembly reference?)