Hi. Welcome to justanswer.
First backup your data and then format the sd card. Then make a video and check if you are getting the error or not.
Can you play the video without any error?
Press MENU button and find the tab called SETUP (or equivalent of it, a spanner icon). Check if you find any option of System Frequency?
Do you have any other sd card?
Yes it is the sd card. Try formatting it two three times through computer. If it is still not working then better dump that card. It has become corrupted.
Do yo have any other query?
Okay I will do that.
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