Problems with file_exists() with metabox plugin in WordPress

Only one way to fix this. Shorten the file path. My suggestion is that you contact the plugin author and report this as a bug. I also suggest doing a security review of your site, because that looks somewhat suspicious to me. There’s no good reason for a file path to be that long. It’s either malicious, or a bug in code results in an unexpected file path formulation.

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