ORA-01565: error in identifying file

we get errors below while doing adcfgclone in test environment.

Problem:

ORA-01565: error in identifying file '/test1_db/sys/system11.dbf'
ORA-27048: skgfifi: file header information is invalid



Solution:

Resize dbfs which are full.


How to detect and fix a corruption in the datafile OS header/Block Zero - ORA-27047 (Doc ID 360032.1)
So please run the following command on the source database
dbfsize /test1_db/sys/system11.dbf