QlikView models are not reloaded automagically - you have to set up a reload on your own. This can be done from QMC, assuming you have access to it, or using Windows Scheduler or another scheduler.
If you've set up a reload from QMC, you should be able to see the latest log for that file by clicking it and selecting "Show task details" under Status/Tasks (the first screen). If you want to see the actual file's reload log, it's typically in the same folder as the file itself, assuming you've turned on logging (not turned on by default, iirc).
Open the file, check the "Generate logfile" box, and run it again. That should give you a detailed log with the specific error, in an easy-to-find location. Reading the server's error messages tends to be difficult.