#1235 assertion error - program died

[Anonymous]

program.name=DocFetcher
program.version=1.1.18
program.build=20160725-2146
program.portable=true
java.runtime.name=Java(TM) SE Runtime Environment
java.runtime.version=1.8.0_101-b13
java.version=1.8.0_101
sun.arch.data.model=64
os.arch=x86_64
os.name=Mac OS X
os.version=10.11.6
user.language=en
java.lang.AssertionError: file _a.fdt does not exist
at org.apache.lucene.index.IndexWriter.filesExist(IndexWriter.java:4524)
at org.apache.lucene.index.IndexWriter.startCommit(IndexWriter.java:4574)
at org.apache.lucene.index.IndexWriter.prepareCommit(IndexWriter.java:3453)
at org.apache.lucene.index.IndexWriter.commitInternal(IndexWriter.java:3524)
at org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:1879)
at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1822)
at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:1786)
at net.sourceforge.docfetcher.model.index.IndexWriterAdapter.close(IndexWriterAdapter.java:101)
at net.sourceforge.docfetcher.model.index.file.SimpleDocWriter.close(SimpleDocWriter.java:54)
at com.google.common.io.Closeables.close(Closeables.java:80)
at com.google.common.io.Closeables.closeQuietly(Closeables.java:99)
at net.sourceforge.docfetcher.model.index.file.FileIndex.doUpdate(FileIndex.java:209)
at net.sourceforge.docfetcher.model.TreeIndex.update(TreeIndex.java:148)
at net.sourceforge.docfetcher.model.index.Task.update(Task.java:98)
at net.sourceforge.docfetcher.model.index.IndexingQueue.threadLoop(IndexingQueue.java:193)
at net.sourceforge.docfetcher.model.index.IndexingQueue.access$100(IndexingQueue.java:46)
at net.sourceforge.docfetcher.model.index.IndexingQueue$2.run(IndexingQueue.java:118)

[Nam-Quang Tran]

Some of DocFetcher's index files were probably deleted by an external process; you should rebuild your indexes.