FOUND IT !
Lua Code:
--local pctexts = zo_strformat( '|c736F6E(<<1>>%)|r', pccurrent ) --> error
local pctexts = zo_strformat( '(<<1>>%)', pccurrent ) --> OK
and then i use this code in
Lua Code:
local finaldbgtext=zo_strformat( '|c6BB5FF<<1>>|r |c736F6E-> <<2>> / <<3>> <<4>>|r |cFFFFFF[<<t:5>>]|r', self:FormatAmount(RealGain), self:FormatAmount(SkillXp), self:FormatAmount(SkillXpTotal), pctexts, skillName )
So, i think that use coloration two times on the same text gives an error with zo_strformat().
it's now corrected.
thx merlight for help.