This error can be solved by two ways
1. Can be solved by importing layout from a different client GOTO T-code GLPLIMPORT enter client 000 --> execute--> select a layout with error (0FAGL-01) -->execute
this will solve the error and GP12N can be done.
or else next method can be used for translating layout
2. Translate layout 0FAGL-01 from DE german to EN english (your logon language) GOTO T-code FAGLPLD enter Planning layout and select planning layout and translate form
Hope this will solve your error.