using jena to convert an owl file to N-triple from terminal returns an empty file -


i have generated owl file using generator http://swat.cse.lehigh.edu/projects/lubm/

i want transform file in n-triples , have done before using 

$ riot -out n-triple ~/lubm20/*.owl > lubm20.nt

for reason empty file (lubm20.nt)

and when use 

$ rdfcat -out n-triple ~/lubm20/*.owl > lubm20.nt

i error 

exception in thread "main" org.apache.jena.riot.riotexception: <file:///root/lubm20/classes\university0_0.owl> code: 4/unwise_character in path: character matches no grammar rules of uris/iris. these characters permitted in rdf uri references, xml system identifiers, , xml schema anyuris. @ org.apache.jena.riot.s5ystem.iriresolver.exceptions(iriresolver.java:371) @ org.apache.jena.riot.system.iriresolver.resolve(iriresolver.java:328) @ org.apache.jena.riot.system.iriresolver$iriresolversync.resolve(iriresolver.java:489) @ org.apache.jena.riot.system.iriresolver.resolveiri(iriresolver.java:254) @ org.apache.jena.riot.system.iriresolver.resolvestring(iriresolver.java:233) @ org.apache.jena.riot.sysriot.choosebaseiri(sysriot.java:109) @ org.apache.jena.riot.adapters.adapterfilemanager.readmodelworker(adapterfilemanager.java:286) @ org.apache.jena.util.filemanager.readmodel(filemanager.java:341) @ jena.rdfcat.readinput(rdfcat.java:328) @ jena.rdfcat$readaction.run(rdfcat.java:473) @ jena.rdfcat.go(rdfcat.java:231) @ jena.rdfcat.main(rdfcat.java:206)

the generator generate known semantic web benchmark dataset how can have

unwise_character s?

edit: question asked used line generate *.owl files 

java edu.lehigh.swat.bench.uba.generator -onto http://swat.cse.lehigh.edu/onto/univ-bench.owl univ 20

then moved *.owl files lubm20 folder

i used rdf2rdf instead of jena

java -jar rdf2rdf-1.0.1-2.3.1.jar /lubmdata/lubm100/*.owl lubm100.nt

worked charm

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