jar - java.lang.nullpointerexception from a library in android -


i trying create library , jar points , create kml file. so, in fact created library , jar file. created project test library, project returns me error.

05-09 23:32:49.804: e/androidruntime(12249): java.lang.runtimeexception: error occured while executing doinbackground() 05-09 23:32:49.804: e/androidruntime(12249):    @ android.os.asynctask$3.done(asynctask.java:200) 05-09 23:32:49.804: e/androidruntime(12249):    @ java.util.concurrent.futuretask$sync.innersetexception(futuretask.java:274) 05-09 23:32:49.804: e/androidruntime(12249): caused by: java.lang.nullpointerexception 05-09 23:32:49.804: e/androidruntime(12249):    @ br.ufc.kmzexporter.exporter.exportarkmlutil.addpoints(exportarkmlutil.java:71) 05-09 23:32:49.804: e/androidruntime(12249):    @ br.ufc.kmzexporter.exporter.exportarkmlutil.criardocumento(exportarkmlutil.java:62) 05-09 23:32:49.804: e/androidruntime(12249):    @ br.ufc.kmzexporter.exporter.exportarkmlutil.expotar(exportarkmlutil.java:45) 05-09 23:32:49.804: e/androidruntime(12249):    @ com.example.testadorkmzexporter.mainactivity$exportarkmltask.doinbackground(mainactivity.java:90) 05-09 23:32:49.804: e/androidruntime(12249):    @ com.example.testadorkmzexporter.mainactivity$exportarkmltask.doinbackground(mainactivity.java:1)

in code, created necessary objects generate kml file , called progressdialog call method create , export file.

i have no idea whats problem. project using library created, , library created uses methods of library. associated 2 libraries in project , put both jars in libs folder. can me?


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