Simulink仿真modle error

[alex_magicsky]

错误提示：Derivative input 1 of 'sever/Transfer Fcn' at time 0.08212698554400622 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances).
source:unknown

Simulink之中的debugger中的有错误的模块的输出:Warning: 'Signal storage reuse' is enabled for this model. Block I/O values displayed in the debugger may be not be correct.
In order to preserve block output signal values, consider disabling the 'Signal storage reuse' option in the 'Optimization' page of the Configuration Parameters dialog.
> In <a href="error:\Program Files\MATLAB\R2007a\toolbox\simulink\simulink\sldebugui.m,71,1">sldebugui at 71</a>
Warning: 'Block reduction optimization' is enabled for this model. Some non-virtual blocks may not execute due to optimization.
To be able to execute all non-virtual blocks consider disabling the 'Block reduction optimization' option in the 'Optimization' page of the Configuration Parameters dialog.
> In <a href="error:\Program Files\MATLAB\R2007a\toolbox\simulink\simulink\sldebugui.m,71,1">sldebugui at 71</a>
Warning: Using a default value of 0.2 for maximum step size. The simulation step size will be equal to or less than this value. You can disable this diagnostic by setting 'Automatic solver parameter selection' diagnostic to 'none' in the Diagnostics page of the configuration parameters dialog.
> In <a href="error:\Program Files\MATLAB\R2007a\toolbox\simulink\simulink\sldebugui.m,71,1">sldebugui at 71</a>

[alex_magicsky]

在下刚刚接触不久，遇到这个问题很是费解，希望各位高手不吝赐教，在下感激不尽！

[alx]

检查你的系统是否稳定，可能是不稳定，数据溢出。