Hello, I am developing an Android app in which i need offline map so am using OSMdroid 4.1 and slf4j1.5.8 libs but its showing the error in xml file such as "java.lang.ClassNotFoundException: org.osmdroid.views.MapView ". I have set all require permissions. In xml layout file its just showing the grid but app get crashed. Is there any way to come out of it?

Hello, I am developing an Android app in which i need offline map so am using OSMdroid 4.1 and slf4j1.5.8 libs but its showing the error in xml file such as "java.lang.ClassNotFoundException: org.osmdroid.views.MapView ". I have set all require permissions. In xml layout file its just showing the grid but app get crashed. Is there any way to come out of it?