SOLR Error 500: default search field ‘name’ not defined or not indexed

While I was trying to upgrade from Solr 3.5 to 4.6, I encountered this error.

{msg=SolrCore 'core0' is not available due to init failure: default search field 'name' not defined or not indexed. Schema file is /opt/jetty/solr/./cores/core0/schema.xml,trace=org.apache.solr.common.SolrException: SolrCore 'core0' is not available due to init failure: default search field 'name' not defined or not indexed. Schema file is /opt/jetty/solr/./cores/core0/schema.xml
at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:818)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:289)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:197)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:499)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
at org.eclipse.jetty.server.Server.handle(Server.java:350)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:630)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:620)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538)
at java.lang.Thread.run(Thread.java:722)

Caused by: org.apache.solr.common.SolrException: default search field 'name' not defined or not indexed. Schema file is /opt/jetty/solr/./cores/core0/schema.xml
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:608)
at org.apache.solr.schema.IndexSchema.(IndexSchema.java:166)
at org.apache.solr.schema.IndexSchemaFactory.create(IndexSchemaFactory.java:55)
at org.apache.solr.schema.IndexSchemaFactory.buildIndexSchema(IndexSchemaFactory.java:69)
at org.apache.solr.core.CoreContainer.createFromLocal(CoreContainer.java:554)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:592)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:271)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:263)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
… 1 more
Caused by: org.apache.solr.common.SolrException: default search field 'name' not defined or not indexed
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:507)
… 15 more
,code=500}

On my schema.xml

<field name="name" type="text_general" indexed="true" stored="true" required="false" />

On my data-config.xml

<field column="name" name="name"/>

I already did tried to comment out those fields then restart jetty server but no specific errors even on log files.