'MariaDB error an alias was previously found

What's wrong? There is a "count" in red in the code. I get the data when I run the code, but it crashes after refreshing. count= I count the data in the previous column(numb5).

SELECT `id`, `numb1`, `numb2`, `numb3`, `numb4`, `numb5`, COUNT(`id`) over(partition by `numb5`) AS `count`
FROM billing

p.s. numb5 = numb3+numb4

Server version: 10.4.22-MariaDB



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