Hi @BTC
I recently got the same error and found the link below to be helpful
https://help.k2.com/support-services/kbt148815
Also consider configuring via set up manager also.
Hello @BTC ,
It is possible to resolve this by updating the K2 SmartForms Runtime and K2 SmartForms Designer web.config files to reflect the correct runtime urls. In each .config file, the below node will be present:
"<wsFederation passiveRedirectEnabled="false" issuer="http://none" realm="<configuredURL>/Runtime(or /Designer)/" requireHttps="false" />"
Updating the realm="<configuredURL>/Runtime(or /Designer)/" to "<expectedURL>/Runtime(or /Designer/" in both files may resolve the issue.
If it does not, the issue can also be resolved by running the Setup Manager using the Configure option. When prompted to select the K2 site on the "K2 Site Configuration" step, click 'Use an existing Web site' then click on 'Bindings.' Ensure the correct binding is selected, then click 'Ok' and proceed to finish the Configure.
Ref:https://help.k2.com/support-services/kbt167989