GWT 2.7.0 Compile Errors

I have Compile an old GWT project under the plugin GWT 2.7.0 , but i have some errors because the incompatibility between the old version and the new version of the GWT.
What is the solution for this error ???

--------------------------------------------------------------------------------------------

 [ERROR] An 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:121)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:296)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)

at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:128)

at com.google.gwt.dev.jjs.ast.JCastOperation.traverse(JCastOperation.java:67)

at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)

at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:128)

at com.google.gwt.dev.jjs.ast.JBinaryOperation.traverse(JBinaryOperation.java:83)

at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)

at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:128)

at com.google.gwt.dev.jjs.ast.JExpressionStatement.traverse(JExpressionStatement.java:42)

at com.google.gwt.dev.jjs.ast.JModVisitor$ListContext.traverse(JModVisitor.java:95)

at com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemove(JModVisitor.java:351)

at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:92)

at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)

at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:149)

at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:145)

at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:83)

at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)

at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:600)

at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:569)

at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)

at com.google.gwt.dev.jjs.impl.UnifyAst.mainLoop(UnifyAst.java:1505)

at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:870)

at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.unifyJavaAst(JavaToJavaScriptCompiler.java:1305)

at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.constructJavaAst(JavaToJavaScriptCompiler.java:1038)

at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.precompile(JavaToJavaScriptCompiler.java:954)

at com.google.gwt.dev.jjs.MonolithicJavaToJavaScriptCompiler.precompile(MonolithicJavaToJavaScriptCompiler.java:303)

at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:38)

at com.google.gwt.dev.Precompile.precompile(Precompile.java:286)

at com.google.gwt.dev.Precompile.precompile(Precompile.java:229)

at com.google.gwt.dev.Precompile.precompile(Precompile.java:145)

at com.google.gwt.dev.Compiler.run(Compiler.java:206)

at com.google.gwt.dev.Compiler.run(Compiler.java:158)

at com.google.gwt.dev.Compiler$1.run(Compiler.java:120)

at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)

at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)

at com.google.gwt.dev.Compiler.main(Compiler.java:127)

Caused by: java.lang.IncompatibleClassChangeError: Found interface com.google.gwt.core.ext.typeinfo.JClassType, but class was expected

at com.extjs.gxt.ui.rebind.core.TemplatesGenerator$SourceGenerator.validateType(TemplatesGenerator.java:142)

at com.extjs.gxt.ui.rebind.core.TemplatesGenerator$SourceGenerator.generate(TemplatesGenerator.java:97)

at com.extjs.gxt.ui.rebind.core.TemplatesGenerator.generate(TemplatesGenerator.java:56)

at com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40)

at com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:760)

at com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:160)

at com.google.gwt.dev.shell.StandardRebindOracle$Rebinder.rebind(StandardRebindOracle.java:79)

at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:276)

at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:265)

at com.google.gwt.dev.DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(DistillerRebindPermutationOracle.java:87)

at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createStaticRebindExpression(UnifyAst.java:485)

at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createRebindExpression(UnifyAst.java:443)

at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleMagicMethodCall(UnifyAst.java:576)

at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.endVisit(UnifyAst.java:306)

at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:248)

at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)

at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)

... 45 more

      [ERROR] at GridView.java(1311): GWT.create(GridTemplates.class)

         com.google.gwt.dev.jjs.ast.JMethodCall

      [ERROR] at GridView.java(1311): (GridTemplates) GWT.create(GridTemplates.class)

         com.google.gwt.dev.jjs.ast.JCastOperation

      [ERROR] at GridView.java(1311): this.templates = (GridTemplates) GWT.create(GridTemplates.class)

         com.google.gwt.dev.jjs.ast.JBinaryOperation

      [ERROR] at GridView.java(1311): this.templates = (GridTemplates) GWT.create(GridTemplates.class)

         com.google.gwt.dev.jjs.ast.JExpressionStatement

      [ERROR] at GridView.java(1310): {

  this.templates = (GridTemplates) GWT.create(GridTemplates.class);

}

         com.google.gwt.dev.jjs.ast.JBlock

      [ERROR] at GridView.java(1310): {

  this.templates = (GridTemplates) GWT.create(GridTemplates.class);

}

         com.google.gwt.dev.jjs.ast.JMethodBody

      [ERROR] at GridView.java(1310): protected void initTemplates();

         com.google.gwt.dev.jjs.ast.JMethod

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