Had the following error with my set. Tried again with another set started from scratch with nothing but a single standard M15 card on it and got the same error.
[Window Title]
Error
[Main Instruction]
An internal error occured:
[Content]
Expected a card field with name 'card color'
Please save your work (use 'save as' to so you don't overwrite things)
and restart Magic Set Editor.
You should leave a bug report on https://github.com/twanvl/MagicSetEditor2/issues/
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Call stack:
[00] 00007FF65F555567
[01] 00007FF65F3E67C7
[02] 00007FF65F4F53EC
[03] 00007FF65F7412B4
[04] 00007FF65F76FFB4
[05] 00007FF65F7711E3
[06] 00007FF65F76FEB8
[07] 00007FF65F5D357E
[08] 00007FF65F76FF0C
[09] 00007FF65F770D3A
[10] 00007FF65F629CB4
[11] 00007FF65F67EC2B
[12] 00007FF65F67F610
[13] 00007FF65F5C1ADC
[14] CallWindowProcW
[15] DispatchMessageW
[16] 00007FF65F6C2129
[17] 00007FF65F7C0F05
[18] 00007FF65F7C0D7E
[19] 00007FF65F7C0FCA
[20] 00007FF65F74228D
[OK]
Had the following error with my set. Tried again with another set started from scratch with nothing but a single standard M15 card on it and got the same error.