Magento 2 Upgrade Error: ltrim() Expects String – Solution

Problem is in below line in fourth argument ,Fourth argument must be array

->addColumn(
        'store_id',
        \Magento\Framework\DB\Ddl\Table::TYPE_TEXT,
        255,
        null,
        ['nullable' => false],
        'Store ID'
    )

It should be

->addColumn(
            'store_id',
            \Magento\Framework\DB\Ddl\Table::TYPE_TEXT,
            255,
            ['nullable' => false],
            'Store ID'
        )

When you look at this

  public function addColumn($name, $type, $size = null, $options = [], $comment = null)

This function accept fourth argument as array thats why it create issue in your setup script.

This issue is showing after the data migration because some product or category have duplicate rewrite Url in url_rewrite table

a) You can search the duplicate url and rename/ remove

b) vendor/magento/module-url-rewrite/Model/Storage/DbStorage.php

Edit this file or overwrite this file

            protected function insertMultiple($data)
                {
                    try {
                        return true;

Note : after changes run the reindex command

php bin/magento indexer:reindex