Hi,
I investigated your problem. There are 2 problems:
1) your ontology has many imports, and they cannot be resolved (e.g.
http://swrl.stanford.edu/ontologies/built-ins/3.3/temporal.owl give a 403 HTTP error). Actually, you don't need these imports (I think they are "hardcoded" in Pellet), so I removed all of them.
2) Your SWRL rule is not defined with the correct RDF syntax. You defined it as:
<swrl:Imp rdf:ID="Rule-1">
<swrl:head>
...
</swrl:head>
<swrl:body>
...
</swrl:body>
</swrl:Imp>
but the correct syntax is:
<rdf:Description>
<rdf:type rdf:resource="
http://www.w3.org/2003/11/swrl#Imp"/> <swrl:head>
...
</swrl:head>
<swrl:body>
...
</swrl:body>
</rdf:Description>
Jiba