They are a step away from the end, but I still can not see the end

Today I installed vqmod and then "sell a voucher as products" but now gives me a problem with product placement and a mistake on the home eShop
When I go to add a product he tells me product inserted correctly, but then in the file "error log" gives me these errors and the product is added:
02/02/2016 9:44:42 - PHP Notice: Error: Unknown column 'voucheramount' in 'field list' <br /> Error No: 1054 <br /> INSERT INTO oc_product Sept. model = 'Riga pink', voucheramount = '0', voucher = '0', sku = '', UPC = '', ean = '', jan = '', isbn = '', mpn = '', location = '', quantity = '1 ', minimum =' 1 ', subtract =' 1 ', stock_status_id =' 7 ', date_available =' 2/2/2016 ', manufacturer_id =' 0 ', shipping =' 1 ', price =' 160 ', points = '0', weight = '0', weight_class_id = '1', length = '0', width = '0' height = '0', length_class_id = '1', status = '1', tax_class_id = '0 ', sort_order =' 1 ', date_added = NOW () in /home/kids2/public_html/eshop/system/library/db/mysqli.php on line 41
02/02/2016 9:44:42 - PHP Notice: Error: Duplicate entry '0-1' for key 'PRIMARY' <br /> Error No: 1062 <br /> INSERT INTO oc_product_description September product_id = '0', language_id = '1', name = 'pink line', description = '<p> </ p>', tag = 'body, girl', meta_title = 'pink line', meta_description = '', meta_keyword = '' in /home/kids2/public_html/eshop/system/library/db/mysqli.php on line 41
02/02/2016 9:44:42 - PHP Notice: Error: Duplicate entry '0-0' for key 'PRIMARY' <br /> Error No: 1062 <br /> INSERT INTO oc_product_to_store September product_id = '0', STORE_ID = '0' in /home/kids2/public_html/eshop/system/library/db/mysqli.php on line 41
02/02/2016 9:44:42 - PHP Notice: Error: Duplicate entry '0 to 182' for key 'PRIMARY' <br /> Error No: 1062 <br /> INSERT INTO oc_product_to_category September product_id = '0', category_id = '182' in /home/kids2/public_html/eshop/system/library/db/mysqli.php on line 41
02/02/2016 9:44:42 - PHP Notice: Error: Duplicate entry '0 to 186' for key 'PRIMARY' <br /> Error No: 1062 <br /> INSERT INTO oc_product_to_category September product_id = '0', category_id = '186' in /home/kids2/public_html/eshop/system/library/db/mysqli.php on line 41
02/02/2016 9:44:42 - PHP Notice: Error: Duplicate entry '0-0' for key 'PRIMARY' <br /> Error No: 1062 <br /> INSERT INTO oc_product_to_layout September product_id = '0', STORE_ID = '0', layout_id = '0' in /home/kids2/public_html/eshop/system/library/db/mysqli.php on line 41
And when I open the home of the home page I have this error:
Notice: Undefined index: value in /home/kids2/public_html/eshop/vqmod/vqcache/vq2-system_library_cart.php online 372Notice: Undefined index: value / home / kids2 / public_html / eshop / vqmod / vqcache / VQ2-system_library_cart php on line 468
Now you tell me what to do?
In the installation guide was written: if you have vqcache enabled, delete all files under vqmod / vqcache.
What does it mean? I have to delete all the files in the folder via FTP vqmod / vqcache?
What you say it is better than the gate module and I find another?
Thank you all for your support!
Manuela