ERROR MESSAGE

[osahonjeffery]

I am trying to run an interactive model using the intercationR code but I am getting the the error below

Error in Surv(rep(1, 5678L), case) : object 'case' not found
In addition: Warning message:
In interactionR(fit4, exposure_names = c("X1", "X18"), ci.type = "delta", :
Recoding exposures; new reference category for X18 is 0 and for X18:X1 is 1

This is my code
fit4 <- clogit(case~X18*X1+strata(pair), dat2)
value4<-interactionR(fit4,
exposure_names = c("X1", "X18"),
ci.type = "delta", ci.level = 0.95,
em = F, recode = T)
interactionR_table(value4)

Meanwhile, my X18 is a risk factor >1 coded as "1" predictive why my X1 is preventive coded as "1". my data is a case-control data.

Please I need help to debug this error