An error occurred calling 'NewSubProperty' in 'PropertyObject' of 'NI TestStand API 3.0' Error Code:-17500;Operation Failed. valueType = "PropValType_String";Boolean and Number OK!
"Only a life lived in the service to others is worth living..." - Albert Einstein
have you looked at this response as it may be related, http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=50650000000800000006CB0000&UCATEGORY_0=_8_&UCATEGORY_S=0