[R-sig-ME] What does that mean?

[DESPINA MICHAILIDOU]

I am trying to run the following analysis and receive the following output

glmm_Comb_PH_tod <- glmer(Comb_PH_tod~ CA_effect + (1 | ID/SCAN_DATE/Side),
data=TAK_data, family=binomial(link = "logit"))
summary(glmm_Comb_PH_tod)

Output
Error in length(value <- as.numeric(value)) == 1L :
  (maxstephalfit) PIRLS step-halvings failed to reduce deviance in
pwrssUpdate
> summary(glmm_Comb_PH_tod)
Error in summary(glmm_Comb_PH_tod) : object 'glmm_Comb_PH_tod' not found

How can I fix that? Any suggestions? I am very new to R.

Thank you in advance.
Despina

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