why this error in console ,please!!!
java.lang.UnsatisfiedLinkError: no mapnik-jni in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source) ~[na:1.8.0_191]
at java.lang.Runtime.loadLibrary0(Unknown Source) ~[na:1.8.0_191]
at java.lang.System.loadLibrary(Unknown Source) ~[na:1.8.0_191]
at mapnik.Mapnik.initialize(Mapnik.java:91) ~[mapnik-jni.jar:na]
at mapnik.Mapnik.initialize(Mapnik.java:127) ~[mapnik-jni.jar:na]