Update for the new FileIOError error code (#276)

Author: hdgarrood

errors/CannotGetFileInfo.md

@@ -0,0 +1,17 @@
+# `FileIOError`
+
+## Cause
+
+This error indicates that an I/O error occurred while compiling. This could be
+caused, for example, by trying to write a compilation artifact to a directory
+on a filesystem which has no space left on it, or by not having read or write
+permissions on an output directory. The error message should usually contain
+sufficient information to identify the specific issue.
+
+## Fix
+
+- If the error is due to having run out of space, try deleting or moving some
+  files.
+- If the error is due to permissions issues, check that you are running the
+  compiler as the user you intended, and try changing the ownership of the
+  output directory to the intended user.