在编写程序中，存在计算式J1 = -(L1 - Vs1*(T7))/((T5*T5*T5)/6 + ((T3*T3)/2 - (T2)*(T3) - T1*(T3) + (T2*T2)/2 + T1*T1/2)*(T5) + (T3*T3*T3)/6 - (T3)*((T3*T3)/2 - (T2)*(T3) - T1*(T3) + (T2*T2)/2 + T1*T1/2) + T1*(T6*T6) + (T2)*(T1*(T2) - T1*T1/2) - (T6)*((T5*T5)/2 + (T3*T3)/2 - (T4)*(T5) - (T2)*(T3) - T1*(T5) - T1*(T3) + (T4*T4)/2 + (T2*T2)/2 + T1*T1/2 + T1*(T6)) - ((T6*T6)*(T7))/2 + ((T6)*(T7*T7))/2 + (T6*T6*T6)/6 - T1*(T2*T2) + (T1*T1*(T2))/2 - (T5)*((T5*T5)/2 + (T3*T3)/2 - (T4)*(T5) - (T2)*(T3) - T1*(T3) + (T4*T4)/2 + (T2*T2)/2 + T1*T1/2) - (T4*T4*T4)/6 + ((T4*T4)*(T5))/2 - ((T4)*(T5*T5))/2 - (T2*T2*T2)/6 + (T1*(T7*T7))/2 - ((T2)*(T3*T3))/2 + ((T2*T2)*(T3))/2 - (T1*(T2) - T1*T1/2)*(T3) - T1*T1*T1/6 + (T7)*((T5*T5)/2 + (T3*T3)/2 - (T4)*(T5) - (T2)*(T3) - T1*(T5) - T1*(T3) + (T4*T4)/2 + (T2*T2)/2 + T1*T1/2 + T1*(T6)) + (T1*(T5*T5))/2 - (T7*T7*T7)/6 - (T1*(T3*T3))/2 + (T6)*((T5*T5)/2 + (T3*T3)/2 - (T4)*(T5) - (T2)*(T3) - T1*(T3) + (T4*T4)/2 + (T2*T2)/2 + T1*T1/2) - T1*(T6)*(T7) - T1*(T5)*(T6) + T1*(T2)*(T3));
当在程序中打开某一位置的这个表达式之后，就会报下面的错误，这个表达式在整个程序中多次使用，前面可以正常使用，后面在使用就会报错，这是为什么？
