diff --git a/exe/shoplex b/exe/shoplex
index 75c841d..b2c600b 100755
--- a/exe/shoplex
+++ b/exe/shoplex
@@ -2,6 +2,6 @@
 
 require 'shoplex'
 
-puts Shoplex::process ARGF.read
+puts Shoplex::process(ARGF.read).csv_out
 
 exit 0
diff --git a/exe/shoplex-web b/exe/shoplex-web
index 1578407..309c399 100755
--- a/exe/shoplex-web
+++ b/exe/shoplex-web
@@ -87,9 +87,10 @@ __END__
   %h2 Result
   %h3 Errors and invoices to look out for
   %div(style="color: red")
-    Errors here
+    #{@result.errors.count} errors here
+    #{@result.errors.inspect}
   %h3 Lexware file
-  %a{role: 'button', href:"data:attachment/csv;charset=utf-8,#{URI.encode_www_form_component @result}", target: '_blank', download: 'filename.csv'}
+  %a{role: 'button', href:"data:attachment/csv;charset=utf-8,#{URI.encode_www_form_component @result.csv_out}", target: '_blank', download: 'filename.csv'}
     Download file
   %pre
-    = @result
+    = @result.csv_out
diff --git a/lib/shoplex.rb b/lib/shoplex.rb
index d901a42..5dca39a 100644
--- a/lib/shoplex.rb
+++ b/lib/shoplex.rb
@@ -15,16 +15,19 @@ module Shoplex
   class Error < StandardError; end
 
   def self.process file_content
-    shopware_invoices = Shoplex::ShopwareCSVParser.parse(file_content).invoices
-    bookings = shopware_invoices.map do |invoice|
+    result = Shoplex::ShopwareCSVParser.parse(file_content)
+    bookings = result.invoices.map do |invoice|
       begin
         Shoplex::ShippingSplitter::apply!(invoice:)
         Shoplex::InvoiceBookingConverter.convert(invoice:)
       rescue => e
+        result.mark_error(maker: self, error: :unknown, obj: [e, invoice])
         STDERR.puts e
+        STDERR.puts e.backtrace
       end
     end.compact
 
-    return Shoplex::LexwareCSV.create_from(bookings:)
+    result.csv_out = Shoplex::LexwareCSV.create_from(bookings:)
+    return result
   end
 end
diff --git a/lib/shoplex/result.rb b/lib/shoplex/result.rb
index 481d18f..15e33e4 100644
--- a/lib/shoplex/result.rb
+++ b/lib/shoplex/result.rb
@@ -1,7 +1,8 @@
 module Shoplex
   class Result
     attr_accessor :invoices
-    attr_accessor :errors
+    attr_reader   :errors
+    attr_accessor :csv_out
 
     def initialize
       @invoices = []
diff --git a/lib/shoplex/shopware_csv_parser.rb b/lib/shoplex/shopware_csv_parser.rb
index 366cc8a..3a4531d 100644
--- a/lib/shoplex/shopware_csv_parser.rb
+++ b/lib/shoplex/shopware_csv_parser.rb
@@ -14,6 +14,8 @@ def self.parse csv_file_content
             result.invoices << create_invoice_from(row:)
           rescue => e
             result.mark_error(maker: self, error: :creation_failed, obj: [e, row])
+            STDERR.puts e
+            STDERR.puts e.backtrace
           end
         else
           result.mark_error(maker: self, error: :no_invoice_number, obj: row)
diff --git a/test/test_shoplex.rb b/test/test_shoplex.rb
index 817a3e2..79a4681 100644
--- a/test/test_shoplex.rb
+++ b/test/test_shoplex.rb
@@ -8,12 +8,12 @@ def test_that_it_has_a_version_number
   end
 
   def test_it_ignores_lines_without_invoice_number
-    result_file_content = Shoplex::process(File.read('test/files/two_lines_one_invoice_shopware.csv', encoding: Encoding::ISO_8859_1))
+    result_file_content = Shoplex::process(File.read('test/files/two_lines_one_invoice_shopware.csv', encoding: Encoding::ISO_8859_1)).csv_out
     assert_equal 3, result_file_content.lines.count
   end
 
   def test_it_does_the_whole_shebang
-    result_file_content = Shoplex::process(File.read('test/files/two_lines_one_invoice_shopware.csv', encoding: Encoding::ISO_8859_1))
+    result_file_content = Shoplex::process(File.read('test/files/two_lines_one_invoice_shopware.csv', encoding: Encoding::ISO_8859_1)).csv_out
     expected = <<~CSV
      26.10.2022,6010,6010 90067  LastNameOfBill,59.39,11100,0,EUR
      26.10.2022,6010,6010 90067  LastNameOfBill,2.23,0,8300,EUR