your model number, avialable in the
“settings menu” → Plus/System → About phone → “Model number”
must be supported by the device code name of the build you choose.
example :
model name : Galaxy s7
code name : herolte
model number : SM-G930F, SM-G930FD, SM-G930S, SM-G930K, SM-G930L, SM-G930W8
(lineage_wiki/herolte.yml at master · LineageOS/lineage_wiki · GitHub )