Thank you for this information. I’ve read some pages and maybe, I get an idea.
But I need a starting point to understand this issue completely and want to be sure, that I’ve understood this correctly. Can someone please revise or confirm the following?
Every compilation of a function gets a “time stamp”, here known as world age. If I change dependencies to already compiled functions in a new world and execute my code, I get these errors? (In my case, these functions are parts of packages (e.g. Plots), which heightens the level of complexity to me.)
So, in the end, it is precompilation/recompilation problem, which I can solve by using eval, because @eval forces a new compilation in the latest world (by letting jl_toplevel_eval_flex() decide again, what to do)?