I'm trying to set up alternating row styling on a selection. I click on the first row and drag down to row 145 (where data ends).

Then I go into Conditional Formatting, choose new rule, and am trying to enter this formula:

```
=MOD(ROW(),2)=0
```

When I click OK, I get this not very helpful error in Excel 2016:

```
There's a problem with this formula.
Not trying to type a formula? When the first character is
an equal (=) or minus (-) sign, Excel thinks it's a formula.
<snip>
```

What is wrong with the formula?

`=MOD(ROW(),2)=0`

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