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src/Column/AbstractColumn.php:220:62: PossiblyNullArgument: Argument 1 of mb_strtolower cannot be null, possibly null value provided (see https://psalm.dev/078)

src/Column/AbstractColumn.php:339:51: InvalidNullableReturnType: The declared return type 'string' for Yiisoft\Yii\DataView\Column\AbstractColumn::renderHeaderCellContent is not nullable, but 'null|string' contains null (see https://psalm.dev/144)

src/Column/AbstractColumn.php:341:16: NullableReturnStatement: The declared return type 'string' for Yiisoft\Yii\DataView\Column\AbstractColumn::renderHeaderCellContent is not nullable, but the function returns 'null|string' (see https://psalm.dev/139)

src/Column/ActionColumn.php:110:17: TypeDoesNotContainType: Type '' for $label is always !=string() (see https://psalm.dev/056)

src/Column/ActionColumn.php:110:42: RedundantCondition: Type '' for $label is always =string() (see https://psalm.dev/122)

src/Column/ActionColumn.php:237:20: UndefinedMethod: Method Yiisoft\Yii\DataView\Column\ActionColumn::getContent does not exist (see https://psalm.dev/022)

src/Column/ActionColumn.php:243:37: UndefinedMethod: Method Yiisoft\Yii\DataView\Column\ActionColumn::createDefaultButtons does not exist (see https://psalm.dev/022)

src/Column/ActionColumn.php:253:21: RedundantConditionGivenDocblockType: Docblock-defined type Closure for $this->buttons[$name] is always Closure (see https://psalm.dev/156)

src/Column/ActionColumn.php:275:93: MixedInferredReturnType: Could not verify return type 'string' for Yiisoft\Yii\DataView\Column\ActionColumn::createUrl (see https://psalm.dev/047)