graphql error: Unexpected token < in JSON at position 0

[deemaxx]

I am getting an error despite the activated plugin. The console reports a parse error which points to the usage of a PHP7 null coalescing operator (??):
Parse error</b>: syntax error, unexpected '?' in <b>/wordpress/web/app/plugins/graphql-wp/Type/Definition/WPPost.php

I am running a Docker container on PHP5.6. The graphql-wp repo's composer.json file requires php>=5.6. So, maybe it requires now PHP7. But, I am confused because no one has mentioned this anywhere.

[tim-field]

Whoops yeah, you are right. Is it possible for you to switch to 7? I'll update the composer.json now. I suspect there might be other issues as I've been developing this in 7 for a while now.

[deemaxx]

Yes, I updated PHP to version 7.1 and it is now working fine. I was just confused at first. Thanks.

[tim-field]

Glad to hear and thanks for reporting. Sorry for not having composer up to date.

[chrisfullman]

I resolved this issue by flushing the rewrite rules (Settings > Permalinks > Save). Turns out that the endpoint was just getting a 404 page until I flushed the rules.