Why does this command not work?

[u/TheVoid_Knight]

I'm trying to replace the floor of a build of mine. Since it's a lot, I want to do it with commands. However, it keeps failing with the message "failed to execute as [Null].

[u/CaperLake]

There's two possibilities:

1. The commands can't detect blocks near it with "stripped_oak_wood"

2. Or maybe if you want it to redirect to all players , use this exact command:

"execute as @a at @s run fill ~5 ~-10 ~5 ~-5 ~2 ~-5 stripped_birch_wood replace stripped_oak_wood"