What should I do when I got this numbers? about luatrace HOT 1 OPEN

luatrace: tracing with C hook
[LUA-print] ooo
ERROR (   1, line       1): recorded execution of 7.395 microseconds at line 23 in an unknown stack frame at height 0
ERROR (   2, line       2): recorded execution of 0.375 microseconds at line 26 in an unknown stack frame at height 0
ERROR (   3, line       3): recorded execution of 0.192 microseconds at line 351 in an unknown stack frame at height 0
Total time  7962 nanoseconds
Times in nanoseconds
Top 20 lines by total time
File:line  Hits  Total   Self  Child | Line

Top 20 functions by self time
File:lines  Hits  Total   Self  Child | Line

luatrace.tron()
-- a(5)
print("ooo")
luatrace.troff()