Advice needed - compile error while moving back to GWT 2.7 from 2.8.2

We have to move our project back to GWT 2.7 due to some java 1.8 issues. I've checked all my jar files to make sure they are 2.7 and no duplicate jars in the build path but am getting errors when I try to compile with Ant.

Any suggestions would be greatly appreciated. Thank you.

prepareGWT:

[delete] Deleting directory C:\Users\s235985\workspace\wkflw_test\Approval\gwt-unitCache

[java] Compiling module com.aep.mro.approval.approvalsystem

[java] Computing all possible rebind results for 'gwtupload.client.bundle.UploadCss'

[java] Rebinding gwtupload.client.bundle.UploadCss

[java] Invoking generator com.google.gwt.resources.rebind.context.InlineClientBundleGenerator

[java] Initializing ResourceGenerator

[java] [ERROR] Unable to determine default for GSS in UiBinder

[java] [ERROR] An internal compiler exception occurred

[java] com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.

[java] at com.google.gwt.dev.jjs.ast.JVisitor.translateException(JVisitor.java:121)

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

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

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

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

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

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

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

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

[java] at com.google.gwt.dev.jjs.ast.JDeclarationStatement.traverse(JDeclarationStatement.java:49)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[java] Caused by: java.lang.NoSuchMethodError: com.google.gwt.util.tools.Utility.close(Ljava/lang/AutoCloseable;)V

[java] at com.google.gwt.resources.rg.ImageResourceGenerator.getContentLength(ImageResourceGenerator.java:623)

[java] at com.google.gwt.resources.rg.ImageResourceGenerator.prepare(ImageResourceGenerator.java:584)

[java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.initAndPrepare(AbstractClientBundleGenerator.java:1013)

[java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.initAndPrepare(AbstractClientBundleGenerator.java:1039)

[java] at com.google.gwt.resources.rebind.context.AbstractClientBundleGenerator.generateIncrementally(AbstractClientBundleGenerator.java:419)

[java] at com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:754)

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

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

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

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

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

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

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

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

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

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

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

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

[java] ... 40 more

[java] [ERROR] at UploadCss.java(9): GWT.create(UploadCss.class)

[java] com.google.gwt.dev.jjs.ast.JMethodCall

[java] [ERROR] at UploadCss.java(9): (UploadCss) GWT.create(UploadCss.class)

[java] com.google.gwt.dev.jjs.ast.JCastOperation

[java] [ERROR] at UploadCss.java(9): final static UploadCss INSTANCE = (UploadCss) GWT.create(UploadCss.class)

[java] com.google.gwt.dev.jjs.ast.JDeclarationStatement

[java] [ERROR] at UploadCss.java(8): {

[java] final static UploadCss INSTANCE = (UploadCss) GWT.create(UploadCss.class);

[java] }

[java] com.google.gwt.dev.jjs.ast.JBlock

[java] [ERROR] at UploadCss.java(8): {

[java] final static UploadCss INSTANCE = (UploadCss) GWT.create(UploadCss.class);

[java] }

[java] com.google.gwt.dev.jjs.ast.JMethodBody

[java] [ERROR] at UploadCss.java(8): private static final void $clinit();

[java] com.google.gwt.dev.jjs.ast.JMethod

BUILD FAILED

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