https://learninghub.kx.com/forums/topic/u-fail-when-running-q-map
what does u-fail mean when running .Q.MAP[], I encounter this problem when running for PracticalGuidance for segmentedDatabase chapter...
u-fail means there is something not quite right with your database structure, that is no longer unique or parted https://code.kx.com/q/ref/set-attribute/#errors
In the case of .Q.MAP in this notebook, the database structure should have 3 table names, par.txt and a sym file.
thanks, just cross checked my files, i have a duplicate path of /d3 in the par.txt. after removing it and reload of db, the issue is resolved