Please read the answer to the same issue here. There you can find more information about the cause of the issue and how it can be resolved.
This sort of error would usually occur when you have a custom java action and a library are you are using requires permission to read or write to a java property.
Is this just happening locally? If so turn off emulate cloud security in the project properties.
You can change your .policy file to allow these java properties to be accessed.
See this: https://forum.mendix.com/questions/5099/javautilPropertyPermission-access-denied
Which might help.