[ERROR] Cannot open master file /usr2/sched/vlbi2023.txt (program line: 295)
[ERROR] Session was never prepared for observation: SNAP file of session wf101r does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session s2158a does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session s2164a does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session s2172a does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session s2200a does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session s2214a does not exist (program line: 363)
[ERROR] Cannot do backup of session s2263a (program line: 442)
[ERROR] Session was never prepared for observation: SNAP file of session v22346 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22347 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session s22347 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session s2347a does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session vo2348 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22348 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22349 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session s22407 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22353 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22354 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22355 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22356 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22357 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22361 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22362 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session vo2363 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22363 does not exist (program line: 363)
[ERROR] Session was never prepared for observation: SNAP file of session v22364 does not exist (program line: 363)