[erlang-questions] A question on sys:trace

Dmitry mbike2000ru@REDACTED
Tue May 30 13:19:38 CEST 2017

My application has a name - ws.
When I tried to trace calls it gives me exeptiion error
sys:trace(ws,true).** exception exit: {noproc,{sys,trace,[ws,true]}}
Why does such an error occur?
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