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Investopedia explains 'Benchmark Error'
When creating a market portfolio under the capital asset pricing model (CAPM), it is important to use the most appropriate benchmark, or market, in your calculations. If, for example, you want to create a portfolio of American stocks using the CAPM, you would not use the Nikkei - a Japanese index - as your benchmark.
Accordingly, if you want to compare your portfolio returns, you should use an index that contains similar stocks. For example, if your portfolio is tech-heavy, you should use the Nasdaq as your benchmark, rather than the S&P 500.
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