garchFit错误：solve.default中的错误（适合$ hessian）：系统是计算奇异的：互惠条件数= 9.58802e-18

Question

我正在使用R来适应AR-GARCH模型并出现以下错误。有办法解决吗？

fit1=garchFit(~ arma(1,0)+garch(2,1), data = M1[,1], cond.dist = "sstd", trace = FALSE)
Error in solve.default(fit$hessian) : 
  system is computationally singular: reciprocal condition number = 9.58802e-18