How to use the crash.Marshaller.loads function in crash

def toCrash(self, getMemoryDump = False):
        """
        Returns a L{Crash} object using the data retrieved from the database.

        @type  getMemoryDump: bool
        @param getMemoryDump: If C{True} retrieve the memory dump.
            Defaults to C{False} since this may be a costly operation.

        @rtype:  L{Crash}
        @return: Crash object.
        """
        crash = Marshaller.loads(str(self.data))
        if not isinstance(crash, Crash):
            raise TypeError(
                "Expected Crash instance, got %s instead" % type(crash))
        crash._rowid = self.id
        if not crash.memoryMap:
            memory = getattr(self, "memory", [])
            if memory:
                crash.memoryMap = [dto.toMBI(getMemoryDump) for dto in memory]
        return crash

def toCrash(self, getMemoryDump = False):
        """
        Returns a L{Crash} object using the data retrieved from the database.

        @type  getMemoryDump: bool
        @param getMemoryDump: If C{True} retrieve the memory dump.
            Defaults to C{False} since this may be a costly operation.

        @rtype:  L{Crash}
        @return: Crash object.
        """
        crash = Marshaller.loads(str(self.data))
        if not isinstance(crash, Crash):
            raise TypeError(
                "Expected Crash instance, got %s instead" % type(crash))
        crash._rowid = self.id
        if not crash.memoryMap:
            memory = getattr(self, "memory", [])
            if memory:
                crash.memoryMap = [dto.toMBI(getMemoryDump) for dto in memory]
        return crash