NoClassDefFoundError: org/apache/oro/text/regex/MalformedPatternException

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/oro/text/regex/MalformedPatternException at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createNTFTPEntryParser(DefaultFTPFileEntryParserFactory.java:184) at org.apache.commons.net.ftp.parser.DefaultFTPFile