Warning messages: 1: In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv, : unable to evaluate scaled gradient 2: In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv, : Model failed to converge: degenerate Hessian wi

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Hi there! I am analizing ecology data about soil seed bank. I've done a GLMM (gaussian distribution) where my fixed variable is Seedling density and my random efects are the site, plot and subplot. I've used this code: glmm1<-glmer(Seedling_density+1~Treatment+(1|sitio/Parcela/subplot),family= gaussian(link=identity),na.action="na.fail",data=datos) and I've recived this warning message: Warning messages:
1: In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv, :
unable to evaluate scaled gradient
2: In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv, :
Model failed to converge: degenerate Hessian with 3 negative eigenvalues

I am kind of new using R studio and also doing stadistics, and I am very confused with this message. I would very greatful if you could help me to fixed the problem.

Thanks in advanced

2

Check this StackOverflow post to see if that resolves the problem.

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