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We address the problem of analyzing the effect of channel estimation errors on the average block error probability (BLEP) of transmit beamforming multiple input single output (MISO) system in a slowly varying Rayleigh fading wireless channel. For this purpose, we develop an accurate model of estimation errors in a block fading context and derive an analytical expression quantifying the impact of channel estimation errors on feedback MISO systems. In particular, the block fading model implies that the channel estimate and its error component are fixed for the entire block and an appropriate performance criteria is the average BLEP, a more complex metric to analyze. The derived closed form analytical expression for the average BLEP is validated by simulations.