225: Tagged list lacks tags

This error typically occurs when you have started a block with the characters <>< which are expected at the beginning of some multiple-tagged lists that set an origin. In your case, the block apparently does not contain any tags though. A tag is content enclosed in pointy brackets at the start of a line.

Solution

Make sure your tagged list does not only set the origin with <><>, but also has other items with tags enclosed in the pointy brackets like in the following example. Mind that there are no blank lines between items of a list:

<><> AND
<0><0> 0
<0><1> 0
<1><0> 0
<1><1> 1

If you do not want to have a tagged list but want to print the characters <>< literally at the start of a block, you can do so by adding a backslash before them: \<><

If you mean to start a bulleted list whose first item starts with a literal less-than sign, add a backslash (or simply a space in this case) before the literal less-than sign: <>\<

If you mean to start a bulleted list whose first item is indented, you can do that with a dot before a single rhombus .<> instead of two rhombuses.