I was getting that for a while when I tried watching or playing anything. Even the ringtones wouldn't work. Have you tried a battery pull yet? That's what worked for me.
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ive gotten that same error since day one and yes I have 4.5 all my settings are as should be etc. I had decided to blame SunCom and hope when T-mo takes over? Its not quite the same but blueapplemobi is the next best thingblueapple.mobi web video search
When you do a battery pull, take the battery out while the power is on. Leave it out for at least 30 seconds and put it back in. Try it again and see if it works.
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