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usually, errors thrown by any of the predictive tools are caused by input data (all the R based tools are very sensitive in terms of data types, NULL values).
You used an Impute tool to fill Null values for some fields, and it works fine for most of them - with the exception of "income". For this field, an additional field "income_" is returned, while the field "income" is NULL. These NULL values are handed over to PCA resulting in the error message you see, so the error is caused by the Imputation tool.
To avoid this, I've modified your workflow (added a Select tool to remove the field containing only NULL values and rename the "income_" field). Now it should work as expected.