Cannot run a test case that tries to set a blob value

[abstratt]

Cannot run a test case that tries to set a blob value (in this case, the Expense tests).

    operation receiptProvided();
    begin
        var expense : Expense;
        begin
            expense := Tests#declare(500.0);
            Assert#isTrue(expense.receiptRequired);
        end;
        begin
            expense.receipt := new Picture;
            Assert#isTrue(not expense.receiptRequired);
            expense.submit();
        end;
    end; 

Will result in:

✘ expenses_tests::Tests.receiptProvided
Cause: com.abstratt.kirra.KirraException: Unknown namespace: mdd_media