I have installed Appian 7.5 on my local system having Windows 7. Tempo & Des

Looking at your logs, I see a lot of errors that are indicative of a misconfigured system (errors with WEB-INF/conf/security/spring-security-05-web-api.xml, IPC errors indicating that communications with the engines is failing, etc.).

Maybe those are from earlier and resolved those though, because I don't think you could have reached this interface with those errors.

The one thing I do see is that you are attempting to access the admin console as the Administrator user. Use a different user of type System Administrator instead. The Administrator user is specifically prohibited from accessing the Administration Console in order ensure that all changes can be traced to a specific named user rather than a shared account. (forum.appian.com/.../Appian_Administration_Console.html

The interface should have displayed a friendlier message to you about the error rather than showing you that "Unrecoverable" error dialog. There is either some bug that caused that message to not appear as it should have or it's a result of a latent misconfiguration.

Looking at your logs, I see a lot of errors that are indicative of a misconfigured system (errors with WEB-INF/conf/security/spring-security-05-web-api.xml, IPC errors indicating that communications with the engines is failing, etc.).

Maybe those are from earlier and resolved those though, because I don't think you could have reached this interface with those errors.

The one thing I do see is that you are attempting to access the admin console as the Administrator user. Use a different user of type System Administrator instead. The Administrator user is specifically prohibited from accessing the Administration Console in order ensure that all changes can be traced to a specific named user rather than a shared account. (forum.appian.com/.../Appian_Administration_Console.html

The interface should have displayed a friendlier message to you about the error rather than showing you that "Unrecoverable" error dialog. There is either some bug that caused that message to not appear as it should have or it's a result of a latent misconfiguration.