Getting error code 1 while upgrading ADC
Upgrade through CLI if GUI fails during Citrix ADC upgrade from 13.0 to 13.1 got failed with below error. "there was a problem with your upload. Failed with error code:1, please try again"

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1. Download ADC upgrade image on the local machine 
2. Transfer file on the ADC manually, using softwares like WinSCP
3. The file to be uploaded on /var/nsinstall directory.
4. Login to ADC over CLI:-
5. Under shell prompt, go to cd /var/nsinstall
6. Run " tar -xvzf  <filename>"
7. Run ./installns
8. This will upgrade your ADC .
9. You can monitor the ADc coming back up post reboot on 

• CMD > ping -t <NSIP>

https://docs.citrix.com/en-us/citrix-adc/current-release/upgrade-downgrade-citrix-adc-appliance/upgrade-standalone-appliance.html