I'm stuck on the misssion Cesar Vialapino. The Garage door won't open for me when it asks you to back the lowrider into the mod garage. I've tried different cars and it won't open for any of them. I have the San Andreas Modern Mod installed. Is there a way to skip this mission with a code or something? I've looked on some websites but haven't found anything so far. Some help would be appreciated. Thanks.