XML Reader error:Downcasting from UNICODE to ASCII'.

problem
sources are XML Files.When I run the
workflow some sessions are failing and the error mesg in log is
'XML Reader error:Downcasting from UNICODE to ASCII'.This happens
only with some XML files.

solved

Goto Informatica PowerCenter Administration Console (8.1) >> change ascii to unicode

You can configure general properties for the Integration Service. You can override some of these properties at the session level or workflow level. To override these properties, configure the properties for the session or workflow.

To edit the general properties, select the Integration Service in the Navigator, and then click the Properties tab > General Properties > Edit.

Solved

others fix the xml file :

Please find the below link to get the XML parser tool.

www.architag.com/xray/

you can use this tool to parse your xml.

you have to update your source xml code page to UNICODE.