This problem is sometimes occurring on MAC computers where priveleges are set differently
The way to solve this is to ensure that the VL-Wizard application has READ/WRITE authorization.
Step 1: go to the /Application folder and locate the VL-Wizard application
Step 2: right click on the VL-Wizard icon and select "GET INFO"
Step 3: ensure Privelege settings for (Me) and Everyone are set to "Read/Write".