I followed the instructions for the update procedure. but when I try to open a survey that was already in the system I get this error:
I included a pdf with all the debug.


Twig_Error_Loader

Unable to find template "./subviews/content/main" (looked into: /var/www/html/application/views, /var/www/html/upload/themes/survey/cec/views, /var/www/html/upload/themes/survey/eduspot/views, /var/www/html/themes/survey/vanilla/views).

/var/www/html/themes/survey/vanilla/views/subviews/content/mainrow.twig(28)
16
17

18
19

20
21 {# This is the main block that will be replaced/extended by other layouts#}
22
23 {# Include the various Warnings (preview mode, unanswered mandatory questions, etc) #}
24 {{ include('./subviews/messages/warnings.twig') }}
25
26 {# Wich file to include for content is decided inside the layout #}
27 {% if(include_content) != "./subviews/content/" %}
28 {{ include(include_content) }}
29 {% endif %}
30
31
32

33

sorry for the inconvenience: we changed a bit the file structure of themes for 3.1
please, try to uninstall an reinstall vanilla, cec and eduspot themes.