If *Missing* is showing up under the Plot Style Table (pen assignments) top-right of the Page Setup/Plot dialog box, it's because AutoCAD cannot find that CTB file in the pathed folder, as configured in Options --> Files (as shown in the image below).
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If you place the CTB file that is missing, in your case ARC-PLAN-SHOP A0.ctb in the same folder that is pathed (as shown above), the MISSING will be gone, as the CTB file is not stored in the Plot Style Table Support Path.
If you do not have that CTB file, or no longer need it, as others suggested in this thread, select the new/required CTB and Apply to Layout, or Plot to save and retain the new plot configuration.
Chad Franklin
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