[R] could not find function "flexsurvreg"

[Shah Alam]

Dear All,
I am analyzing trial data for survival. During the loading of the R package
"flexsurv", the following error message appeared.

"Loading required package: survival
Error: package or namespace load failed for ‘flexsurv’ in loadNamespace(j
<- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called ‘lifecycle’

Despite installing lifecycle package, loading lifecycle package results in
the following error message:

Error in library(lifecycle) : there is no package called ‘lifecycle’

Moreover, the flexsurvreg function in the flexsurv library also produces an
error:

Error in flexsurvreg(Surv(Time, Event) ~ 1, anc = NULL, data = data1,  :
  could not find function "flexsurvreg"

Several times I have installed and uninstalled packages, re-started R, but
the error persists.

Could anyone help me with the flexsurv package, why is it not working?

Best regards,
Shah

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