Jena 3.2.0 tdbload2 riotException: Failed to determine the content type - jena

I used tdbload2 (in jena3.2.0) to build database from freebase-rdf-latest.
An error occured,
[cc#localhost dir]$ ../apache-jena-3.2.0/bin/tdbloader2 --loc=./d-freebase/ ./freebase-rdf-latest
21:33:22 INFO -- TDB Bulk Loader Start
21:33:22 INFO Data Load Phase
21:33:22 INFO Got 1 data files to load
21:33:22 INFO Data file 1: freebase-rdf-latest
INFO Load: freebase-rdf-latest -- 2017/04/06 21:33:23 CST
org.apache.jena.riot.RiotException: Failed to determine the content type: (URI=freebase-rdf-latest : stream=null)
at org.apache.jena.riot.RDFDataMgr.process(RDFDataMgr.java:854)
at org.apache.jena.riot.RDFDataMgr.parse(RDFDataMgr.java:667)
at org.apache.jena.riot.RDFDataMgr.parse(RDFDataMgr.java:637)
at org.apache.jena.riot.RDFDataMgr.parse(RDFDataMgr.java:626)
at org.apache.jena.riot.RDFDataMgr.parse(RDFDataMgr.java:617)
at org.apache.jena.tdb.store.bulkloader2.ProcNodeTableBuilder.exec(ProcNodeTableBuilder.java:78)
at tdb.bulkloader2.CmdNodeTableBuilder.exec(CmdNodeTableBuilder.java:113)
at jena.cmd.CmdMain.mainMethod(CmdMain.java:93)
at jena.cmd.CmdMain.mainRun(CmdMain.java:58)
at jena.cmd.CmdMain.mainRun(CmdMain.java:45)
at tdb.bulkloader2.CmdNodeTableBuilder.main(CmdNodeTableBuilder.java:61)
21:33:23 ERROR Failed during data phase
But when I used tdbload2 in jena 2.12.1, no error occured!
So, I wonder why RiotException was raised when I used tdbload2 in jena 3.2.0?
The format of freebase-rdf-latest,
<http://rdf.freebase.com/ns/american_football.football_player.footballdb_id> <http://rdf.freebase.com/ns/type.object.type> <http://rdf.freebase.com/ns/type.property> .
<http://rdf.freebase.com/ns/american_football.football_player.footballdb_id> <http://rdf.freebase.com/ns/type.object.name> "footballdb ID"#en .
<http://rdf.freebase.com/ns/american_football.football_player.footballdb_id> <http://rdf.freebase.com/ns/type.property.unique> "true" .


I'm not sure about Jena version 2.12.1, but I've found with Jena version 3.2.0, I need to specify the content type using the file extension.
Try renaming your input file from "./freebase-rdf-latest" to "./freebase-rdf-latest.nt".

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