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psalm/docs/running_psalm/issues/InvalidArgument.md
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# InvalidArgument
Emitted when a supplied function/method argument is incompatible with the method signature or docblock one.
```php
<?php
class A {}
function foo(A $a) : void {}
/**
* @param string $s
*/
function callFoo($s) : void {
foo($s);
}
```
## Why its bad
Calling functions with incorrect values will cause a fatal error at runtime.
## How to fix
Sometimes this message can just be the result of an incorrect docblock.
You can fix by correcting the docblock, or converting to a function signature:
```php
<?php
class A {}
function foo(A $a) : void {}
function callFoo(A $a) : void {
foo($a);
}
```