Error in mail adapter

Hello,

I am having a strange error.

I have set up a scenario, where the sender adapter reads a file and receiver mail adapter sends the document as an attachment in the mail.

I have configured the scenario, but while testing I came across a strange error.

The mail adapter is sending mails in some cases but sometimes in SXMB_MONI I am seeing the following error.

<SAP:P3>Fatal Error: com.sap.engine.lib.xml.parser.Parser~</SAP:P3>

<SAP:P4 />

<SAP:AdditionalText />

<SAP:ApplicationFaultMessage namespace="" />

<SAP:Stack>com.sap.aii.utilxi.misc.api.BaseRuntimeException thrown during application mapping com/sap/xi/tf/_MessageMapping_Mail_: Fatal Error: com.sap.engine.lib.xml.parser.Parser~</SAP:Stack>

<SAP:Retry>M</SAP:Retry>

</SAP:Error>

I am not able to understand the reason why am I getting error in some scenarios whereas some scenarios are working properly.

Regards,

Mayank