# ParserError: while parsing a block collection

**URL:** <https://forums.docker.com/t/parsererror-while-parsing-a-block-collection/142168>\
**Category:** General\
**Created:** [June 25, 2024, 4:15pm UTC](https://forums.docker.com/t/parsererror-while-parsing-a-block-collection/142168 "2024-06-25T16:15:07Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![tech687](https://sea3.discourse-cdn.com/docker/user_avatar/forums.docker.com/tech687/32/34381_2.png) [@tech687](https://forums.docker.com/u/tech687)\
**Post date:** [June 25, 2024, 4:15pm UTC](https://forums.docker.com/t/parsererror-while-parsing-a-block-collection/142168/1 "2024-06-25T16:15:07Z")

</div>

```auto
$ cat docker-compose.yml
version: "3.8"
services:
    composer:
        image: composer
        volumes:
            - "${COMPOSER_HOME:-$HOME/.config/composer}":/tmp
$ docker-compose run --rm composer sh -c cd .dev && export COMPOSER_VENDOR_DIR=/var/tmp/5434211wefbnv && composer req -vvv workaround/utilities && composer upd && composer rem workaround/utilities
ERROR: yaml.parser.ParserError: while parsing a block collection
  in "./docker-compose.yml", line 6, column 13
expected <block end>, but found '<scalar>'
  in "./docker-compose.yml", line 6, column 57

```

Why?