Thank you for your post. We are aware this issue is happening after the XML release this last weekend.
For technicals, the issue seems to be caused by a product that was removed from our data and this issue wasn't caught in QA. The error seen in our logging is as follows:
2018-04-02T14:29:01.6036934Z 0530 E GuardBoundary.h:29 patchScanEngine::CScanner93::CScanner93InterfaceImpl::Scan XML parsing error: class STXml::CXmlException at ScanParamsDeserializer.cpp:38: vendorId='36 does not exist in the catalog
As a workaround, please try opening your scan template that you use for scanning and hit Save. Then try scanning again. We are seeing this help with the error for now.
I'll update you when the fix has been sent out later.