That means you're missing a file that contains a statement like:```
define('TEXT_FIELD_OPTIONAL', 'blahblahblahblah');
a) requires that define() statement and your upload somehow missed it;
or
b) while uploading, you somehow overwrote an existing file that "had" the define, but the new file does not;
or
c) you edited a file that contains that define() statement, but made a PHP syntax error somewhere, making the rest of the file no longer work after the syntax error
.
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