如上图是错位类型，下图为源代码（会在后面粘贴）

源代码：
Clear["Global`*"]; Clear[Derivative];
g = 9.8; k = 3; m1 = 0.1; m2 = 0.1;
L1 = 1; L2 = 0.2; tm = 100;
initial1 = {0, 1.4/L1}; initial2 = {0, 0.0, -(L1 + L2), 0};
temp = 2*L1*(y2[t]*Cos[\[Theta][t]] - x2[t]*Sin[\[Theta][t]]);
L = Sqrt[(x2[t])^2 + (y2[t])^2 + L1^2 + temp];
equs = {\[Theta]''[t] ==
(y2[t]*Sin[\[Theta][t]] + x2[t]*Cos[\[Theta][t]])*(1 - L2/L)*k/(
m1*L1) - g/L1*Sin[\[Theta][t]],
x2''[t] == -(x2[t] - L1*Sin[\[Theta][t]])*(1 - L2/L)*k/m2,
y2''[t] == -(y2[t] + L1*Cos[\[Theta][t]])*(1 - L2/L)*k/m2 - g,
\[Theta][0] == initial1[[1]], \[Theta]'[0] == initial1[[2]],
x2[0] == initial2[[1]], x2'[0] == initial2[[2]],
y2[0] == initial2[[3]], y2'[0] == initial2[[4]]};
s = NDSolve[equs, {\[Theta], x2, y2}, {t, 0, tm}];

为什么总是说方程的一个参数为False呢？
为Ture的问题之前碰到过解决了，求各位大佬帮忙~
感谢~

无法复现问题，你重启软件得了