return a error message when trying to crypt a ts file (cf. #400)
return a error message when trying to crypt a ts file (cf. #400)

ARSekkat/gpac,gpac/gpac,nguyen-viet-thanh-trung/gpac,gpac/gpac,rbouqueau/gpac,rbouqueau/gpac_brew_travis,rbouqueau/gpac,rauf/gpac,nguyen-viet-thanh-trung/gpac,nguyen-viet-thanh-trung/gpac,RodolpheFouquet/gpac,rbouqueau/gpac_brew_travis,rbouqueau/gpac,rauf/gpac,aymanelyaagoubi/gpac,nguyen-viet-thanh-trung/gpac,rbouqueau/gpac,porcelijn/gpac,rauf/gpac,aymanelyaagoubi/gpac,gpac/gpac,nguyen-viet-thanh-trung/gpac,rbouqueau/gpac_brew_travis,emmanouil/gpac,emmanouil/gpac,rauf/gpac,rauf/gpac,nguyen-viet-thanh-trung/gpac,RodolpheFouquet/gpac,rbouqueau/gpac,gpac/gpac,gpac/gpac,aymanelyaagoubi/gpac,porcelijn/gpac,RodolpheFouquet/gpac,gpac/gpac,RodolpheFouquet/gpac,emmanouil/gpac,rbouqueau/gpac,rbouqueau/gpac_brew_travis,RodolpheFouquet/gpac,ARSekkat/gpac,ARSekkat/gpac,ARSekkat/gpac,emmanouil/gpac,porcelijn/gpac,porcelijn/gpac,ARSekkat/gpac,rbouqueau/gpac,gpac/gpac,rbouqueau/gpac_brew_travis,rauf/gpac,aymanelyaagoubi/gpac,rbouqueau/gpac,emmanouil/gpac,rbouqueau/gpac_brew_travis,porcelijn/gpac,gpac/gpac,ARSekkat/gpac,porcelijn/gpac,RodolpheFouquet/gpac,aymanelyaagoubi/gpac,emmanouil/gpac,aymanelyaagoubi/gpac