问题描述：
mathematical代码：
Clear["Global`*"]
v = 0.3; \[Lambda] = 1; \[Alpha] = 0.5;
sol = NDSolve[{r''[X] + (r'[X])^2/
r[X] ((1 - v) Log[\[Alpha] r[X]] + v Log[r'[X]] +
v Log[\[Lambda]] - v)/(
v Log[\[Alpha] r[X]] + (1 - v) Log[r'[X]] + v Log[\[Lambda]] +
v - 1) ==
0, (1 - v) Log[r'[-1/2]] +
v (Log[\[Alpha] r[-1/2]] + Log[\[Lambda]]) ==
0, (1 - v) Log[r'[1/2]] +
v (Log[\[Alpha] r[1/2]] + Log[\[Lambda]]) == 0},
r, {X, -1/2, 1/2}];
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出现错误：
求教大神问题出现在哪？怎么解决？非常感谢！！！！！！！！！！！！！！！