Two possibilities.
First, the data directory is corrupt. Try deleting server/all/data.
Second, you have deployed a second *-ds.xml file that is using the same Hypersonic
connection url. You need to use a different url (specifically, the database name at the
end of the URL), for example:
<connection-url>jdbc:hsqldb:${jboss.server.data.dir}${/}hypersonic${/}someOtherDB</connection-url>
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