Whenever I leave the chunk I place a sign in, I receive an error saying "Unable to locate sign at [x,y,z]. I have uploaded a sreenshot of said error.
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It is on single player but I use Reis minimap and Optifine (most recent versions)

This ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded MineCraft.
Is this on a server or with mods?
Or do you play with vanilla Minecraft?