Neatline update error - 2.6.4 - Timeline API

[asundberg13]

After upgrading to Neatline ver. 2.6.4 in Omeka Classic, I received the following error message when loading a project:

Deprecated: Required parameter $text follows optional parameter $exhibit in /home/stepping/public_html/unnatural/plugins/Neatline/helpers/Views.php on line 115

That line reads as follows:
function nl_getExhibitAccessibleURL($exhibit=null, $text)

Additionally, it also has an added pop-up error stating the following:
Error: Failed to derive URL prefix for Timeline API code files

I tried loading the page in Firefox and Edge and received similar issues.

All plugins (including Neatline) are updated and installed.