java.lang.InternalError: fillbuf ????

[=?ISO-8859-1?Q?Juan_Manuel_Fern=E1ndez_Luna?=]

Can anybody help me? I'm desperate!!!

I'm writing a program in Java to deal with xml files and when the file
volume.xml (attached) is being parsed, the following exception occurs
and I don't what the problem is.

Please, if you know why it happens or a site where I could ask, tell me.

Best,
Juanma

Exception in thread "main" java.lang.InternalError: fillbuf
at
org.apache.crimson.parser.InputEntity.parsedContent(InputEntity.java:545)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1826)
at
org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1507)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1779)
at
org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1507)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1779)
at
org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1507)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1779)
at
org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1507)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1779)
at
org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1507)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1779)
at
org.apache.crimson.parser.Parser2.externalParsedEntity(Parser2.java:2827)
at
org.apache.crimson.parser.Parser2.expandEntityInContent(Parser2.java:2545)
at
org.apache.crimson.parser.Parser2.maybeReferenceInContent(Parser2.java:2422)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1833)
at
org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1507)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1779)
at
org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1507)
at
org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:500)
at org.apache.crimson.parser.Parser2.parse(Parser2.java:305)
at
org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:442)
at
org.apache.crimson.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:185)
at
javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:161)
at INEXaDOC.main(INEXaDOC.java:71)