LoadError: LoadError: UndefVarError: n_actions not defined

[longjianquan]

i run another pkg,it show above.i use a error branch?

[lassepe]

Hi,

n_actions has been removed in v0.8 (https://github.com/JuliaPOMDP/POMDPs.jl/releases/tag/v0.8.0). Maybe the package that you are using did not set compat bounds in the Project.toml and thus is now using the new (incompatible) version of POMDPs.jl? If that is the case, a quick-fix would be to just add

[compat]
POMDPs = "< 0.8"

to your Project.toml.

If you want to use a later version of POMDPs.jl you would have to replace the uses of n_actions(model) with length(actions(model)).