So you got hired straight out of school, and then let go because you weren't fast enough at working with a non-trivial technology that your employer knew (or should have known) you had little experience in? That doesn't seem reasonable to me at all.
My advice would be to not worry about this and simply job hunt as if this didn't happen. You may need to explain the situation to prospective employers. Mismatch between the job you were hired for and the actual job seems like an honest and succinct description of what happened.
My advice would be to not worry about this and simply job hunt as if this didn't happen. You may need to explain the situation to prospective employers. Mismatch between the job you were hired for and the actual job seems like an honest and succinct description of what happened.