More nim newbie woes, this time echo fmt Possible AOC2021 spoiler

[freeflow]

Unfortunately, the problem has returned. On compilation I'm seeing
    
    
    [Running] nim compile --verbosity:0 --hints:off --run 
"c:\Users\*****\source\repos\AoC2021\Nim\Sources\Main.nim"
    C:\Users\slayc\.choosenim\toolchains\nim-1.6.0\lib\core\macros.nim(533, 3) 
Error: undeclared identifier: 'BoardDatarnalErrorFlag'
    candidates (edit distance, scope distance); see '--spellSuggest':
     (8, 2): 'internalErrorFlag' [proc declared in 
C:\Users\*****\.choosenim\toolchains\nim-1.6.0\lib\core\macros.nim(525, 6)]
    
    
    
    Run

This occurs even when completely deleting my Day04 code leaving only code for 
Day1, 2 and 3 which previously compiled without issue.