Modelsim can not find "altsyncram"

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Dear all, I am using Modelsim for simulation,

Modelsim says" Instantiation of 'altsyncram' failed, the design unit was not found", even though 'altsyncram' is in "Altera_mf" library, listed on the "library Panel".

What should I do?

Thank you very much!

Other errors: "Instantiation of 'oper_selector' failed, the design unit was not found", there is a .ocp file in altmemphy-library, what does it do? should it be included in Modelsim?

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Hello binpersonal,

I also met this problem. Have you fixed it? and How do you solve this problem?

thanks!