Translation:I am tired because I played volleyball yesterday.
That's perfectly fine, having yesterday at the end sounds a lot more natural though
Right now in beta, the translation of 很＋adjective is not being implemented consistently. In some cases, it is requiring that "very" be included in the translation, and in others, such as this case, including "very" is being marked incorrect. I assume this will be rectified before leaving beta stage. :)