Minecraft Java Edition – Fixing Issues When Placing a Sign from a Generator

You should run the following command before the /effect command, to make all entities with the tag "Detector" give all players within a radius of 10 a tooClose score of 1:

/execute @e[tag=Detector] ~ ~ ~ /scoreboard players set @a[r=10,rm=1] tooClose 1

And then reset the score after the /effect command has been run:

/scoreboard players set @a[score_tooClose_min=1] tooClose 0

You can replace r=10 with your detection radius, and tag=Detector with however you're identifying the mobs you are wanting to detect the player, or keep the tag and do something like to add the tag to mobs:

/scoreboard players tag @e[type=Zombie] add Detector

This is a problem I also have when trying to play LAN with a mac and a windows 10 computer. When the mac hosts, everything works out wonderfully. When the windows 10 pc hosts, the mac can't find the LAN world. Here's my solution.

First, host the LAN server on the windows 10 computer. There should be a port given in the chat. Remember it. Then left click on the network icon in the lower right corner of the screen, and press "Network settings". On the screen that pops up, press "Advanced options". Scroll down through the properties until you get to the IPv4 address. There should be four numbers separated by periods, similar to this: 192.189.54.78. Remember them.

Now open up your Mac's minecraft. Go to multiplayer, then direct connect. Fill in the address with the IP first, then the port, like this: 192.168.54.78:56234

Then press Join Server, and you're good to go!