what's wrong with my function?

tick.mcfunction...
function commandmarkers:commandloop```
...calls commandloop.mcfunction.
```execute if data storage commandmarkers:commandbuffer main[0] run return
data modify storage commandmarkers:commandbuffer2 main set from storage commandmarkers:commandbuffer main[0]
function commandmarkers:command with storage commandmarkers:commandbuffer2
data remove storage commandmarkers:commandbuffer main[0]
function commandmarkers:commandloop```
Command.mcfunction reads `$execute as @s at @s run $(main)`.  

There appears to be an issue with commandloop.mcfunction, as it displays an error when ran. Unfortunately i don't know what's wrong with it, as minecraft simply just says that it doesn't exist. any help?