Unknown error thrown with large file conversion to dynamic object.

Hello

I am creating an import tool to convert a client's JSON data into IRIS classes.   The sample file is over half a gig.   I am copying the data into an instance of  %Stream.FileCharacter;.    My first few attempts worked fine.   However I started getting an error thrown when I try to create a DynamicAbstractObject using the  %FromJSON method.     See the code below.   The error code given is not in the documentation, at least not the doc that I was searching.   

       "READ error while reading input stream, Line 5121169 Offset 23, error code 10"

Can anyone shed light on this error code?

I assume this has something to do with the file size but I'm not sure since I had success on the first few runs.     Any help is much appreciated!

Thank you!

// Import the stream data into a dynamic object and then into the object properties w "Creating Dynamic Object",!
set jsonError=""

try {

    set DynObj={}.%FromJSON(StreamObj.DataStream)

}

catch errobj 

{

    write errobj.Name_", "_errobj.Location_", error code "_errobj.Code,!
    set jsonError=1
    quit
} 

quit:jsonError