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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