How can i save the error message?

In the execution of the integration process, and i get

the mapping error as follow:

RuntimeException in Message-Mapping transformation: Exception:[java.lang.IllegalArgumentException: Cannot cast to float. ] in class com.sap.aii.mappingtool.flib3.Stat method sum[com.sap.aii.mappingtool.flib3.Plainer@dddd08]

<b>Now what i want is to save this message.</b>

<b>How can i save this message?</b>

Thank you for your advise and reading