Here's the code I run from the command line

public goapp
goapp = newOBJECT("appmanager","appmgr.fxp")
set proc to objdatatype additive
oDataType = createOBJECT('objDataType')

The 'invalid subscript reference' pops up on the 3rd line shown below when the objdatatype tries to go to goapp.

DEFINE CLASS ObjDataType AS CUSTOM
    lnConn = 0
    lnConn = goApp.Connect2SQL('CHROMM')

If I run the exact same line from the command prompt I get a positve value in lnConn (I have an sqlconnection) and no error message.