java.lang.IncompatibleClassChangeError: Implementing class

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class com.qop pa.pdfProcess.PDFDocument has interface com.qoppa.pdfViewer.g.k as super class
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java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:289)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at com.bea.sdo.impl.binding.DynamicBindingSystem.getClassForName(DynamicBindingSystem.java:115)
at com.bea.sdo.impl.binding.DynamicBindingSystem.addMapping(DynamicBindingSystem.java:104)
at com.bea.sdo.impl.binding.BindingSystemBase.readBindingSystem(BindingSystemBase.java:479)
at com.bea.sdo.impl.binding.BindingSystemBase.loadBindingSystem(BindingSystemBase.java:362)
at com.bea.sdo.impl.binding.BindingSystemBase.loadBindingSystemWithId(BindingSystemBase.java:312)
at com.bea.sdo.impl.binding.BindingSystemBase.loadFromTopLevelElemQName(BindingSystemBase.java:229)
at com.bea.sdo.impl.binding.BindingSystemBase.loadGlobalPropertyByTopLevelElemQName(BindingSystemBase.java:153)
at com.bea.sdo.impl.helpers.XSDHelperImpl.getGlobalProperty(XSDHelperImpl.java:156)
at com.bea.sdo.impl.marshal.PlainUnmarshaller.getPropertyByName(PlainUnmarshaller.java:1075)
at com.bea.sdo.impl.marshal.PlainUnmarshaller.startElement(PlainUnmarshaller.java:93)
at com.bea.sdo.impl.marshal.DOMLoader.processElement(DOMLoader.java:112)
at com.bea.sdo.impl.marshal.DOMLoader.load(DOMLoader.java:59)
at com.bea.sdo.impl.helpers.XMLHelperImpl.load(XMLHelperImpl.java:134)
at com.bea.dsp.das.ws.SoapCodecHandler.getComplexTypeReturn(SoapCodecHandler.java:460)
at com.bea.dsp.das.ws.SoapCodecHandler.getResponse(SoapCodecHandler.java:322)
at com.bea.dsp.das.ws.SoapCodecHandler.handleResponseInBody(SoapCodecHandler.java:503)
at com.bea.dsp.das.ws.SoapCodecHandler.handleResponse(SoapCodecHandler.java:287)
at com.bea.dsp.das.ws.WSConnection.sendRequest(WSConnection.java:219)
at com.bea.dsp.das.ws.WSConnection.invokeOperation(WSConnection.java:231)
at com.bea.dsp.das.DataAccessServiceImpl.invokeOperation(DataAccessServiceImpl.java:160)
at das.ws.idexxdataservices.casemanagement.DomainValuesDAS.getDomainValues(DomainValuesDAS.java:43)
at com.idexx.ccs.serviceclient.TestGetDomainValues.main(TestGetDomainValues.java:42)

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