I have experienced this. It was due to a posted db being created in a locale that was totally foreign to mine. If I switched to that locale, it was fine. Not something I like doing though.
That you say can not find a solution thru Goggle. could mean that you tried things that didn't work. It might be helpful to know more about that. Also might help to know about what changes were made before this started, or maybe where the db hails from, or if the event is on a subform which references a main form control upon Open or Load. Main form controls are not available to subform Load or Open events.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.