My old (made in 1.8) world won't work in 18w15a. Actually, a snapshot or two ago, it crashed every time I opened it. I loaded an old save and worked up to the point it crashed (bred my horses, etc.). Now, I can't even open (in 18w15a) the old files I've loaded, as they crash every time I play! Even when I go one snapshot back from 18w15a they won't open, they just keep crashing.
We do not have enough information to find the cause of this issue.
Please attach the crash report found in
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder]
here.If you cannot find a crash report, please attach the full launcher log found in
[minecraft/launcher_log.txt|http://hopper.minecraft.net/help/guides/minecraft-logs/]
.This issue has been temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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