Maps With Logi

I want to create a point map based off lat/lon coordinates.  I've created a business view with my lat/lon and additional data.  Lat/lon are both DECIMAL format.  When I enter the formula specified by devnet (and pasted in bold below) I receive an error:

LAT_LON(1,42) : Error : Operator "+" cannot be applied to 'NUMBER' and 'STRING' values
LAT_LON(1,74) : Error : Syntax error

User error?  Is Logi posting bad code?   

"Logi Report also supports using longitudes and latitudes as locations of the markers, however before you can do this, you need to change the value of the className option for geocoding to com.jinfonet.web.modules.map.service.DirectGeoCoder in the file config.json which is stored in <install_root>\gisinfo for both Logi Report Designer and Logi Report Server before starting them, then in Logi Report Designer create a formula as follows and select it from the Location Info drop-down list:"

@LongitudeValue + “,” + @LatitudeValue