Error Code 500 at erpnext 15 after installing print format builder (new) at frappecloud

Hello dear members of this Forum,

Iam using erpnext 15 on frappeframework 15 both installed at frappecloud.com.

I was using the print format builder to make my templates for invoices and sales orders and more and they worked fine.

Two days ago, I installed print format builder (new) through frappecloud and made a new template for invoices and I cant print anymore. After pressing the Print button, I get Errorcode 500 and this message below. I am only using the standard functions of print format builder and have not implemented custom html code.

Anyone could help out please?

Thank you

Klaus

Traceback (most recent call last):
  File "apps/frappe/frappe/website/serve.py", line 20, in get_response
    response = renderer_instance.render()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/website/page_renderers/template_page.py", line 84, in render
    html = self.get_html()
           ^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/website/utils.py", line 529, in cache_html_decorator
    html = func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/website/page_renderers/template_page.py", line 95, in get_html
    self.update_context()
  File "apps/frappe/frappe/website/page_renderers/template_page.py", line 163, in update_context
    data = self.run_pymodule_method("get_context")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/website/page_renderers/template_page.py", line 223, in run_pymodule_method
    return method(self.context)
           ^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/www/printview.py", line 56, in get_context
    body = get_rendered_template(
           ^^^^^^^^^^^^^^^^^^^^^^
  File "apps/frappe/frappe/www/printview.py", line 162, in get_rendered_template
    format_data_map[df.get("fieldname")] = df
                    ^^^^^^
AttributeError: 'str' object has no attribute 'get'