hi Cris,
Can you click on question mark(yellow icon , Ltxt) and share that info with us.
Am expecting your flat file source system connection may be broken.
Can you try to check the flat file source system connections at RSA1--> Source system--> select your flat file source system --> right click --> check.
One more thing can you check your flat file was placed in application server in specified path \\SAPBI2\XYZ\ .
Thanks