vhdl 程序运行时提示Error:Assertion error:CLK1_MULTIPLY_BY(0) must b

vhdl 程序运行时提示Error:Assertion error:CLK1_MULTIPLY_BY(0) must be greater than 0.
具体提示如下：-- Cause:The specified parameter has a value that is not greater than 0
x05-- Action:Set the parameter to a value that is greater than 0
x05ASSERT CLK5_MULTIPLY_BY > 0
x05x05REPORT "CLK5_MULTIPLY_BY(%) must be greater than 0." CLK5_MULTIPLY_BY
x05x05SEVERITY ERROR
x05x05HELP_ID ALTCLKLOCK_STRATIX_PARAMETER_IS_ZERO;为什么会这样?