This is caused by java security setting that is too high or your java version is too old. If updating java to the newest version does not solve your problem, then do the following.
Go to control panel, and select Programs
Once you click on the Programs from the above screen, you can see the screen below with Java in the last row.
Select Java by double clicking it, and you will get the screen below.
Click on the Security tab on the above screen, and slide down the slider from high to medium. Then click Apply button, followed by OK button.
