You must have forgotten to refresh the plugin after replaced it. Remember to refresh the plugin, or it may cause error.

I copied this from the plugin's help section:

 *  v1.2 NEW FEATURES
 *   now you can checked unlock percent of any map using this Plugin Command
 *   mapUnlockedPercent mapId
 *   - mapId = 0 => current map
 *   - mapId = any numbers > 0 => that map
 *   Note: you must set plugin's param save_minimap to TRUE for this to work

One more note that is, a map only get saved when player leave the scene map (open menu/ transfer to other maps)