java - "internal compiler exception occurred" while using gxt grid -

i using gwt 2.5.1 , gxt 2.2.5, bean using:

public class modelo extends basemodel {  public modelo(string nombre,string noparte,string imagen){     this.set("nombre", nombre);     this.set("noparte", noparte);     this.set("path", imagen); }  public string getnombre(){     return (string)get("nombre"); }  public string getnoparte(){     return (string)get("noparte"); } public string getpath(){     return (string)this.get("path"); } 

}

//// data m working with:

public class lista {  public static list<modelo> getlist() {     list<modelo> datos = new arraylist<modelo>();     datos.add(new modelo("bomba wp", "3234343","selyr.jpg"));     datos.add(new modelo("bomba maytag", "343544323","selyr.jpg"));     datos.add(new modelo("cople wp", "12323","selyr.jpg"));             datos.add(new modelo("perros wp", "545563","selyr.jpg"));     datos.add(new modelo("bobinas secadora wp","534532","selyr.jpg"));     datos.add(new modelo("banda maytag","3123123","selyr.jpg"));     return datos; } 

}

////// window configuration

public class carrito extends window {  public carrito(string nombre1) {      this.setheading(nombre1);     this.setwidth(900);     this.setheight(600);     this.setresizable(false);     this.setvisible(true);     this.setlayout(new fitlayout());  }  @override protected void onrender(element parent, int pos) {     super.onrender(parent, pos);      list<columnconfig> configs = new arraylist<columnconfig>();      columnconfig column = new columnconfig();     column.setid("nombre");     column.setheader("nombre producto");     column.setwidth(200);     configs.add(column);      columnconfig column1 = new columnconfig();     column.setid("noparte");     column.setheader("# parte");     column.setwidth(200);     configs.add(column1);      columnconfig column2 = new columnconfig();     column.setid("path");     column.setheader("imagen");     column.setwidth(200);     configs.add(column2);      liststore<modelo> listapiezas = new liststore<modelo>();     listapiezas.add(lista.getlist());      columnmodel cm = new columnmodel(configs);     grid<modelo> grid = new grid<modelo>(listapiezas, cm);     //grid.setstyleattribute("bordertop", "none");     //grid.setautoexpandcolumn("name");     grid.setborders(true);     grid.setstriperows(true);      contentpanel cp = new contentpanel();     cp.setbodyborder(false);     cp.setheading("carrito");     cp.setbuttonalign(horizontalalignment.center);     cp.setlayout(new fitlayout());     cp.setsize(900, 600);     cp.add(grid);      this.add(cp);   } 

}

//// error getting:

         [error] internal compiler exception occurred com.google.gwt.dev.jjs.internalcompilerexception: unexpected error during visit. 

at com.google.gwt.dev.jjs.ast.jvisitor.translateexception(jvisitor.java:109) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:276) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:265) @ com.google.gwt.dev.jjs.ast.jvisitor.accept(jvisitor.java:116) @ com.google.gwt.dev.jjs.ast.jcastoperation.traverse(jcastoperation.java:65) @ com.google.gwt.dev.jjs.ast.jmodvisitor.traverse(jmodvisitor.java:361) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:273) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:265) @ com.google.gwt.dev.jjs.ast.jvisitor.accept(jvisitor.java:116) @ com.google.gwt.dev.jjs.ast.jbinaryoperation.traverse(jbinaryoperation.java:81) @ com.google.gwt.dev.jjs.ast.jmodvisitor.traverse(jmodvisitor.java:361) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:273) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:265) @ com.google.gwt.dev.jjs.ast.jvisitor.accept(jvisitor.java:116) @ >com.google.gwt.dev.jjs.ast.jexpressionstatement.traverse(jexpressionstatement.java:41) @ >com.google.gwt.dev.jjs.ast.jmodvisitor$listcontextimmutable.traverse(jmodvisitor.java:170) @ >com.google.gwt.dev.jjs.ast.jmodvisitor.acceptwithinsertremoveimmutable(jmodvisitor.java:33>6) @ com.google.gwt.dev.jjs.ast.jblock.traverse(jblock.java:83) @ com.google.gwt.dev.jjs.ast.jmodvisitor.traverse(jmodvisitor.java:361) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:273) @ com.google.gwt.dev.jjs.ast.jvisitor.accept(jvisitor.java:137) @ com.google.gwt.dev.jjs.ast.jvisitor.accept(jvisitor.java:133) @ com.google.gwt.dev.jjs.ast.jmethodbody.traverse(jmethodbody.java:82) @ com.google.gwt.dev.jjs.ast.jmodvisitor.traverse(jmodvisitor.java:361) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:273) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:265) @ com.google.gwt.dev.jjs.ast.jmethod.visitchildren(jmethod.java:434) @ com.google.gwt.dev.jjs.ast.jmethod.traverse(jmethod.java:403) @ com.google.gwt.dev.jjs.ast.jmodvisitor.traverse(jmodvisitor.java:361) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:273) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:265) @ com.google.gwt.dev.jjs.impl.unifyast.mainloop(unifyast.java:900) @ com.google.gwt.dev.jjs.impl.unifyast.exec(unifyast.java:625) @ >com.google.gwt.dev.jjs.javatojavascriptcompiler.precompile(javatojavascriptcompiler.java:6>40) @ com.google.gwt.dev.jjs.javascriptcompiler.precompile(javascriptcompiler.java:33) @ com.google.gwt.dev.precompile.precompile(precompile.java:278) @ com.google.gwt.dev.precompile.precompile(precompile.java:229) @ com.google.gwt.dev.precompile.precompile(precompile.java:141) @ com.google.gwt.dev.compiler.run(compiler.java:232) @ com.google.gwt.dev.compiler.run(compiler.java:198) @ com.google.gwt.dev.compiler$1.run(compiler.java:170) @ com.google.gwt.dev.compiletaskrunner.dorun(compiletaskrunner.java:88) @ >com.google.gwt.dev.compiletaskrunner.runwithappropriatelogger(compiletaskrunner.java:82) @ com.google.gwt.dev.compiler.main(compiler.java:177) caused by: java.lang.incompatibleclasschangeerror: found interface >com.google.gwt.core.ext.typeinfo.jclasstype, class expected @ >com.extjs.gxt.ui.rebind.core.templatesgenerator$sourcegenerator.validatetype(templatesgene>rator.java:142) @ >com.extjs.gxt.ui.rebind.core.templatesgenerator$sourcegenerator.generate(templatesgenerato>r.java:97) @ >com.extjs.gxt.ui.rebind.core.templatesgenerator.generate(templatesgenerator.java:56) @ >com.google.gwt.core.ext.incrementalgenerator.generatenonincrementally(incrementalgenerator>.java:40) @ >com.google.gwt.dev.javac.standardgeneratorcontext.rungeneratorincrementally(standardgenera>torcontext.java:657) @ com.google.gwt.dev.cfg.rulegeneratewith.realize(rulegeneratewith.java:41) @ >com.google.gwt.dev.shell.standardrebindoracle$rebinder.rebind(standardrebindoracle.java:79>) @ >com.google.gwt.dev.shell.standardrebindoracle.rebind(standardrebindoracle.java:276) @ >com.google.gwt.dev.shell.standardrebindoracle.rebind(standardrebindoracle.java:265) @ >com.google.gwt.dev.distillerrebindpermutationoracle.getallpossiblerebindanswers(distillerr>ebindpermutationoracle.java:91) @ >com.google.gwt.dev.jjs.impl.unifyast$unifyvisitor.handlegwtcreate(unifyast.java:355) @ >com.google.gwt.dev.jjs.impl.unifyast$unifyvisitor.handlemagicmethodcall(unifyast.java:433) @ com.google.gwt.dev.jjs.impl.unifyast$unifyvisitor.endvisit(unifyast.java:237) @ com.google.gwt.dev.jjs.ast.jmethodcall.traverse(jmethodcall.java:243) @ com.google.gwt.dev.jjs.ast.jmodvisitor.traverse(jmodvisitor.java:361) @ com.google.gwt.dev.jjs.ast.jmodvisitor.accept(jmodvisitor.java:273) ... 42 more [error] @ gridview.java(1362): gwt.create(gridtemplates.class) com.google.gwt.dev.jjs.ast.jmethodcall [error] @ gridview.java(1362): (gridtemplates) gwt.create(gridtemplates.class) com.google.gwt.dev.jjs.ast.jcastoperation [error] @ gridview.java(1362): this.templates = (gridtemplates) >gwt.create(gridtemplates.class) com.google.gwt.dev.jjs.ast.jbinaryoperation [error] @ gridview.java(1362): this.templates = (gridtemplates) >gwt.create(gridtemplates.class) com.google.gwt.dev.jjs.ast.jexpressionstatement [error] @ gridview.java(1361): { this.templates = (gridtemplates) gwt.create(gridtemplates.class); } com.google.gwt.dev.jjs.ast.jblock [error] @ gridview.java(1361): { this.templates = (gridtemplates) gwt.create(gridtemplates.class); } com.google.gwt.dev.jjs.ast.jmethodbody [error] @ gridview.java(1361): protected void inittemplates();

    com.google.gwt.dev.jjs.ast.jmethod  c:\users\nore\documents\netbeansprojects\ventas\nbproject\build-gwt.xml:330: >the     following error occurred while executing line: c:\users\nore\documents\netbeansprojects\ventas\nbproject\build-gwt.xml:479: java   >returned: 1 

in case runs problem. make sure you're using gxt-2.3.0-gwt22.jar library not gxt-2.3.0-gwt2.jar gwt 2.5.1