Symptoms

• Several actions (installing an extension, migrate a site, clone a WP site) fail with the following error being returned in %plesk_dir%admin\logs\php_error.log:

  C:\> [2023-06-08 15:13:40] 19032:64822863f3803 ERR [panel] "C:\Program Files (x86)\Plesk\admin\bin\crontabmng" get psaadm failed with code 1.

• Backup operations end with the warning:

  PLESK_WARN: Warning: Server "trusting-galois.103-20-212-37.plesk.page"
  Unable to back up scheduled tasks. Error: crontabmng failed: Line (1): System.FormatException: Input string was not in a correct format.
  at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
  at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
  at psa.scheduler.device.Parser.GetNumber(Int64 low, String[] names)
  at psa.scheduler.device.Parser.GetRange(Int64 low, Int64 high, String[] names)
  at psa.scheduler.device.Parser.Parse_6_5_FileLine()
  at psa.scheduler.device.PSAScheduler.Load_6_5_File(StreamReader sr)

• Executing any WordPress Toolkit CLI command fails:

  C:\> plesk ext wp-toolkit --list
  crontabmng failed: Line (1): System.FormatException: Input string was not in a correct format.
  at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)
  at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
  at psa.scheduler.device.Parser.GetNumber(Int64 low, String[] names)
  at psa.scheduler.device.Parser.GetRange(Int64 low, Int64 high, String[] names)
  at psa.scheduler.device.Parser.Parse_6_5_FileLine()
  at psa.scheduler.device.PSAScheduler.Load_6_5_File(StreamReader sr)
  (Error code 1)

• The file psaadm in path C:\Program Files (x86)\Plesk\Schedules is missing or corrupted.

• The following command fails with:

  C:\> plesk sbin crontabmng configure-default
  Line (1): System.FormatException: Input string was not in a correct format.

Cause

Crontab's configuration file for the psaadm user is corrupted, therefore any action that involves crontabmng fails.

Resolution

1. Connect to the server via RDP
2. Go to C:\Program Files (x86)\Plesk\Schedules
3. Create a copy of psaadm file
4. Replace psaadm file with the one attached or from a test server