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When QSqlQuery shows an error message about a mismatch in the parameter count, it means that the number of placeholders in the SQL query does not match the number of values provided as input parameters to the query. This often occurs when the number of input values provided is different from the number of placeholders in the query or the values are not being passed to the correct placeholders. This error typically occurs when executing a prepared statement, where the number of placeholders must match the number of input parameters. To resolve this error, ensure that the correct number of input parameters are being passed to the query and that they are being mapped to the correct placeholders in the SQL query.