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I don't know if its related, but I had the same error message after I upgraded to SP2 and discovered the web page was not pulling in the 14_2_0_8 scripts. It was still using the 14_1_50_0 scripts.
You may want to make sure your page is pulling in the right scripts.
In Chrome you can open the developer tools (CTRL + SHIFT + i) and look for the 14_2 versions of the javascript.
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If you don't seem them, try recompiling your page.