I have solved this problem
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 106 bytes)
install the vqmod mod
Upload the folders ‘admin’, ‘system’, ‘vqmod’ and their files
from the ‘upload’ directory to your OpenCart root directory. Do not overwrite any files.
How to use:
login your store with admin then
1.system -> users -> user group – > select top administrator -> select all -> save
2.back your database use System -> Backup/Restore
3.system -> SmartExportImport
How to obtain the sample
You can export EXCEL, this file is an example,
you can modify and add new products in the excel,
if you want to add a product, need to add a new product ID and information in excel,
if you want to modify the products, please find the corresponding product ID ,it can be modified.
then upload the excel to system by smart export import