Running codechecker (version 5.0.0) against a test folder, you may get the error:

Data provider method "xxx" must return an array, a Generator or an Iterable.

Let's assume this is your test starting, for instance, in line 200.

200    /**
201     * test_mymodule_coffee_is_ready
202     *
203     * @covers ::mymodule_coffee_is_ready
204     * @dataProvider mymodule_coffee_is_ready_provider
205     * @param object $userinput The passed user input
206     * @param object $expected The expected result
207     */
208    public function test_mymodule_coffee_is_ready($userinput, $expected) {...

Somewhere else, of course, you are supposed to have the method starting, for instance, in line 100

100    /**
101     * Data provider for mymodule_coffee_is_ready()
102     *
103     * Cases to be tested by mymodule_coffee_is_ready
104     */
105    public function mymodule_coffee_is_ready_provider(): array {...

When codechecker finds the error it dispalys a message like:

#204: ·····*·@dataProvider mymodule_coffee_is_ready_provider
Data provider method "mymodule_coffee_is_ready_provider" must return an array, a Generator or an Iterable.

where the line number shown by the message is the line number of the comment of the testing method where its dataProvider is declared (204, in this example)
and NOT the line number where dataProvider method actually begins (105, in this example)

IMHO this is a bit misleading.