Failed to open .map files, continuing without symbols

[nvjacobo]

when I run:

perf script | ./stackcollapse-perf.pl > out.perf-folded`

Failed to open /tmp/perf-21607.map, continuing without symbols
Failed to open /tmp/perf-12967.map, continuing without symbols
Failed to open /tmp/perf-28472.map, continuing without symbols
Failed to open /tmp/perf-24981.map, continuing without symbols
Failed to open /tmp/perf-28048.map, continuing without symbols
Failed to open /tmp/perf-7905.map, continuing without symbols
Failed to open /tmp/perf-28432.map, continuing without symbols
Failed to open /tmp/perf-28669.map, continuing without symbols
Failed to open /tmp/perf-8011.map, continuing without symbols

Setup

- Debian 10 
- Perf version 4.19.152

Thanks

[ThisIsMython]

I met this problem too.
How to solve it?