chaching file out of range

[wayfarer]

hi, i set fps to 60 , get cache from my character as pc2 and take it to another program, do the cloth simulation and finally i import cloth mesh and pc2 back to si and every thing ok until when i set the fps to 30 (normal) , it's give me this error "chaching file out of range" , what sould i do?
(i set fps to 60 cause cloth simulation is better in slow movements)