How to solve it is quite simple and it can happend in community version, it is a memory error, thus you can increase the following parameters eather in your config file or as passed parameters:
limit_memory_hard
limit_memory_soft
You were maybe setting a too low value for those parameters.
If you
Try first to restore the default values:
limit_memory_soft = 671088640
limit_memory_hard = 805306368
If you still experience it, increase them.
This is only for badst9_alloc error. For other lessc errors, ensure you have the right lessc version:
lessc --version │
lessc 1.4.2 (LESS Compiler) [JavaScript]
If you had a too early version, downgrade it, now you might need to remove (via psql) all assets in table ir_attachment to regenerate them.