Hi James,
Given that the line of code is referencing the source object, I
suspect that the main transformation was not supplying a source
object to the subtransform. Depending on the value of the
REPORTERRORS parameter for you transform and subtransform, the way
this error is handled will vary. It might be worth logging a call
with the WRC to dig into the details of this a bit further, but that
is up to you.
As a side note, messages of this form where you find the text
"logged as '28 May 2012' number 56" (where the date and number vary)
indicate that a full stack trace was logged. You can see the
contents of the stack trace by going to the Application Error Log in
the management portal. In 2010.2 and earlier, this is via System
Management Portal --> System Logs --> View Application Error
Log, and in 2012.1 and later, this is via the portal home page
--> System Operation --> System Logs --> Application Error
Log. Select your namespace and then view the details for the number
in question.
On your system, there seem to be a good number of these (at least
56!), so it may be well worth contacting the WRC to work out why so
many exceptions are being produced.
I hope that helps,
Dale