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OK, you didn't use an if qualifier, so that guess is irrelevant. This is still too close to "My car|cat|partner|phone is not working as desired" to which the answer is "Something must be wrong then".
Please try the following and copy and paste the results without change:
So one of the implications of that is never to paraphrase (until you know enough Stata to be completely sure that the paraphrase omits nothing that might possibly be important).
In particular, if your variable names are not literally variable1 variable2 you naturally will need to use their real names.
THANK YOU for this post! It just helped me to debug my code and figure out that one of my control variables was missing for one of my periods! I've been agonizing over it for a week trying to debug, and FINALLY this worked. Thank you and all who post here. Just saved my paper!
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