Advice Needed - moving to GWT 2.8.2 from 2.7 compile error

I couldn't find another post with this same error but if there is one I apologize.

We are moving a project from GWT 2.7 to GWT 2.8.2 but when we try to compile with Ant we are getting the following error and we haven't found a way to resolve it.

Any suggestions would be appreciated.

Buildfile: C:\Users\s235985\workspace\wkflw_test\Approval\build.xml

init:

prepareGWT:

[java] Exception in thread "main" java.lang.NoSuchMethodError: com.google.gwt.util.regexfilter.RegexFilter: method <init>()V not found

[java] at com.google.gwt.util.regexfilter.WhitelistRegexFilter.<init>(WhitelistRegexFilter.java:21)

[java] at com.google.gwt.dev.jjs.JJSOptionsImpl.<init>(JJSOptionsImpl.java:54)

[java] at com.google.gwt.dev.PrecompileTaskOptionsImpl.<init>(PrecompileTaskOptionsImpl.java:39)

[java] at com.google.gwt.dev.CompilerOptionsImpl.<init>(CompilerOptionsImpl.java:30)

[java] at com.google.gwt.dev.Compiler.main(Compiler.java:108)

BUILD FAILED

C:\Users\s235985\workspace\wkflw_test\Approval\build.xml:48: Java returned: 1

Total time: 6 minutes 20 seconds

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