cfinvoke argument missing??

Hello,

I'm having problem with method invocation. I have the following at the top of my function:

<cfobject component="cfc.main" name="mainCFCObj">

And later on in the code I do invocations as follows:

<cfinvoke component="#mainCFCObj#" method="GetEntriesBySection" returnvariable="sectionData" tableSection="C.1">

I do the above several times (for different methods and arguments) and it works fine until one invocation:

<cfinvoke component="#mainCFCObj#" method="GetAjaxRecordCountForUser" returnvariable="myAjaxRecordCount" username="some_user">

Coldfusion 10 gives me the following error:

The USERNAME parameter to the GetAjaxRecordCountForUser function is required but was not passed in.

Does anyone have any idea about this?? Thank you.