WLS 7 startup errors

[Mandar Gandhe]

Hi..
My WLS 7 server startup is failing with the following errors on console.
Can anyone please help me out ?
Thanks in advance
Mandar
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<Dec 24, 2002 11:35:00 AM GMT> <Critical> <WebLogicServer> <000364> <Server failed during initialization. Exception:weblogic.management.configuration.ConfigurationException: Error parsing the configuration file: Assigning instance of class java.lang.String to field javax.management.MBeanAttributeInfo#attributeType - with nested exception:
[java.lang.ClassCastException: Assigning instance of class java.lang.String to field javax.management.MBeanAttributeInfo#attributeType]
java.lang.ClassCastException: Assigning instance of class java.lang.String to field javax.management.MBeanAttributeInfo#attributeType
at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2266)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:514)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1407)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:381)
at java.io.ObjectInputStream.inputArray(ObjectInputStream.java:1137)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2258)
at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:514)
at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1407)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:381)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:231)
at weblogic.management.internal.Helper.getMBeanInfo(Helper.java:245)
at weblogic.management.internal.Helper.getAdminOrConfigMBeanInfo(Helper.java:136)
at weblogic.management.internal.ConfigurationMBeanImpl.<init>(ConfigurationMBeanImpl.java:113)
at java.lang.reflect.Constructor.newInstance(Native Method)
at weblogic.management.internal.Helper.instantiateDynamicMBean(Helper.java:379)
at weblogic.management.internal.xml.ConfigurationParser$ConfigurationHandler.createAdminMBean(ConfigurationParser.java:523)
at weblogic.management.internal.xml.ConfigurationParser$ConfigurationHandler.startElement(ConfigurationParser.java:317)
at weblogic.apache.xerces.parsers.SAXParser.startElement(SAXParser.java:1348)
at weblogic.apache.xerces.validators.common.XMLValidator.callStartElement(XMLValidator.java:1299)
at weblogic.apache.xerces.framework.XMLDocumentScanner.scanElement(XMLDocumentScanner.java:1821)
at weblogic.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.dispatch(XMLDocumentScanner.java:1197)
at weblogic.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentScanner.java:396)
at weblogic.apache.xerces.framework.XMLParser.parse(XMLParser.java:1119)
at weblogic.management.internal.xml.ConfigurationParser.parse(ConfigurationParser.java:227)
at weblogic.management.internal.xml.XmlFileRepository.createOrLoadDomain(XmlFileRepository.java:483)
at weblogic.management.internal.xml.XmlFileRepository.bootStrapAndLoadActiveDomain(XmlFileRepository.java:354)
at weblogic.management.AdminServer.configureFromRepository(AdminServer.java:217)
at weblogic.management.AdminServer.configureFromRepository(AdminServer.java:202)
at weblogic.management.AdminServer.configure(AdminServer.java:196)
at weblogic.management.AdminServerAdmin.initialize(AdminServerAdmin.java:111)
at weblogic.t3.srvr.T3Srvr.initialize1(T3Srvr.java:659)
at weblogic.t3.srvr.T3Srvr.initialize(T3Srvr.java:589)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:277)
at weblogic.Server.main(Server.java:32)
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[Chris Mathews]

There appears to be a problem with your config.xml file. Do you typically edit this by hand? If so than it is likely you made a typo.
Regardless, you should have a config.xml.booted file that it the last known good configuration. Try starting with that.
If that doesn't work then you may also have a config.xml.FROM_INSTALLER which is essentially the bare minimum configuration needed to start WebLogic.