(in depends/internal) too many levels of recursion
 

求解一个简单的二阶微分方程，不知道哪里出错了，提示迭代次数太多。
麻烦大家帮忙看看，谢谢！
h=dsolve('D2h-20.4*(1/h)+22.81=0','h(0.025)=0.001,Dh(0.025)=0','t')

??? Error using ==> dsolve
Error, (in depends/internal) too many levels of recursion