System Error after upgrading to 7.13.2

[Information Technology]

After attempting to upgrade feomm 7.11.2 to 7.13.2, get this error when Confluence starts. 

Cause

java.lang.RuntimeException: Error rendering template for decorator root
    at com.atlassian.confluence.setup.velocity.ApplyDecoratorDirective.render(ApplyDecoratorDirective.java:162)

caused by: java.lang.RuntimeException: Error rendering template for decorator global
    at com.atlassian.confluence.setup.velocity.ApplyDecoratorDirective.render(ApplyDecoratorDirective.java:162)

caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getRenderedLayoutForGlobal' in class com.refinedwiki.confluence.plugins.theme.original.helpers.ThemeHelper threw exception java.lang.NullPointerException at originaltheme/templates/decorators/global.vmd[line 79, column 74]
    at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(ASTMethod.java:342)

caused by: java.lang.NullPointerException
    at com.refinedwiki.confluence.plugins.theme.original.helpers.ThemeHelper.getRenderedLayoutForGlobal(ThemeHelper.java:805)

Note: Cannot access Confluence web at all to uninstall any apps or templates. 

Any suggestions?

[Medhat Ahmed]

Dear @Information Technology 

if you want to uninstall addon without web portal all addons are stored in your home directory you will find a directory named "plugins" then "installed plugins" please stop confluence first then you can remove addons from their, kindly take a backup from this directory before moving it then try to start confluence again and it will start without any addons.

I think you should review your server.xml configurations.

please accept my answer if it helps you on your issue.

Best Regards,

Medhat