Uncaught Server Exception after upgrade to V12 back to V10

Hello,

I tried to upgrade to V12, but then crashed and I return the erpnext to V10 but it was showing “Uncaught Server Exception” with the below error traceback:

Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 39, in render
data = render_page_by_language(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 133, in render_page_by_language
return render_page(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 149, in render_page
return build(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 156, in build
return build_page(path)
File “/home/frappe/frappe-bench/apps/frappe/frappe/website/render.py”, line 172, in build_page
html = frappe.render_template(context.source, context)
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/jinja.py”, line 75, in render_template
throw(“Illegal template”)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/jinja2/environment.py”, line 1008, in render
return self.environment.handle_exception(exc_info, True)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/jinja2/environment.py”, line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File “”, line 1, in top-level template code
File “/home/frappe/frappe-bench/apps/frappe/frappe/./templates/web.html”, line 1, in top-level template code
{% extends base_template_path %}
File “/home/frappe/frappe-bench/apps/frappe/frappe/./templates/base.html”, line 69, in top-level template code
{% block content %}{% endblock %}
File “/home/frappe/frappe-bench/apps/frappe/frappe/./templates/web.html”, line 47, in block “content”
{%- block page_content -%}{%- endblock -%}
File “”, line 7, in block “page_content”
TemplateNotFound: templates/styles/card_style.css

does anyone can help me solving this issues?

Thanks