The underlying error here is:

org.postgresql.util.PSQLException: ERROR: could not read block 109460 of relation 1663/58766/92059: Invalid argument
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:1525)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1309)

This an error from Postgres indicating that it couldn't read from disk successfully. Try running a disk check utility to ensure that there are not corrupt data files on the drive. This thread indicates that this is often a failing hard drive:

http://www.postgresqlforums.com/forums/viewtopic.php?f=14&t=52