Your error with the function missing is because you are using a function in a plugin and you have not enabled the plugin. This is also a indication that the theme you are using is not one of the distributed ones since they check to be sure the function is present before using it.
Therefore, I suggest you start by using one of the distributed themes. If that works you will have to figure out what is wrong with the theme you are using.
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Therefore, I suggest you start by using one of the distributed themes. If that works you will have to figure out what is wrong with the theme you are using.
but even if i reupload a default new one.. it makes same error.