I.m working with the lib "dmx serial"
I can assure you that there is no library named "dmx serial", for two reasons. One is that library names can not contain spaces. Another is that library names can not contain double quotes.
No, where is your code? Where are the links to the libraries you are using? Clearly, you did not read the posts at the top of this forum regarding how to post in this forum. Read them before replying.