It sounds like this problem: https://www.coh2.org/topic/63599/attribute-editor-crashing-immediately-after-start
The lasts posts mention they fixed it by deleting this folder: C:\Users\NAME\AppData\Local\SEGA\Relic Entertainment\Company of Heroes 2\Attribute Editor
(or move it to be save)
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#Steam AliasWL%Streak
- 1.278110.716+16
- 2.270144.652+2
- 3.29446.865-1
- 4.558230.708+2
- 5.253150.628+14
- 6.968566.631-4
- 7.22491.711+11
- 8.8120.802-1
- 9.19078.709+4
- 10.399200.666+8