Hi,
I don't see any specific problem in line 328 of the plugin "paypal express".
Can you please :
- Redownload HikaShop starter 2.3.0
- Re-test it
- Indicate the line content of the error indicated in the notice (line 328 or maybe a new line number after install the latest 2.3.0 package).
Thanks
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.