Inbound Email template Conversion throws unexpected error

While Converting Inbound e-document I get unexpected error
Below is the template

I use this xml file to convert into a bill
<Bill>
<BillRefId>VEN0010110</BillRefId>
<Vendor>
<Entityid>VEN700034 Amazon</Entityid>
<Address>
<ZIP>10179</ZIP>
<City>Berlin</City>
<Street>ABC</Street>
<Country>Germany</Country>
</Address>
</Vendor>
<Expenses>
<Expense>
<Amount>100.00</Amount>
<Description>ABC</Description>
<TaxAmount>0.00</TaxAmount>
<ExpenseSubtotal>100.00</ExpenseSubtotal>
</Expense>
</Expenses>
<ItemSummary>
<GrossValue>100.00</GrossValue>
</ItemSummary>
</Bill>

When I click on convert button on Inbound E-Documents page it shows unexpected error I don't get any other error which can clarify what exactly is the root cause.
I also tried to run this map reduce script