Hello again!
This is the same problem described here
In this case, the invalid character is in the abstract
<jats:p>This paper investigates the issue of investment in renewable energy (RE) particularly solar photovoltaic (PV) as an electricity supplier and discusses the most important factors which affect the promotion and expansion of PV systems.
In between “af” and “fect”.
The solution is the same. You will need to resubmit the metadata using the Web Deposit Form, but ensure that the text is plain text, without formatting.
Best,
Shayn