SS 4.0.x-dev error installing with composer: Uncaught Exception: More than one YAML document exists named 'mysite'

[GustavoMarcante]

I tried to install SilverStripe 4 using composer create-project silverstripe/installer silverstripe 4.0.x-dev (at /opt linking /opt/silverstripe to /var/www/html) and then browsing to localhost/silverstripe/install.php in a Ubuntu 16.04 desktop.
I got:

Setting up /opt/silverstripe/.htaccess

Fatal error: Uncaught Exception: More than one YAML document exists named 'mysite'. in /opt/silverstripe/vendor/silverstripe/config/src/Transformer/YamlTransformer.php:214 Stack trace: #0 /opt/silverstripe/vendor/silverstripe/config/src/Transformer/YamlTransformer.php(511): SilverStripe\Config\Transformer\YamlTransformer->getNamedYamlDocuments() #1 /opt/silverstripe/vendor/silverstripe/config/src/Transformer/YamlTransformer.php(484): SilverStripe\Config\Transformer\YamlTransformer->filterByOnlyAndExcept() #2 /opt/silverstripe/vendor/silverstripe/config/src/Transformer/YamlTransformer.php(103): SilverStripe\Config\Transformer\YamlTransformer->getSortedYamlDocuments() #3 /opt/silverstripe/vendor/silverstripe/config/src/Collections/MemoryConfigCollection.php(73): SilverStripe\Config\Transformer\YamlTransformer->transform(Object(SilverStripe\Config\Collections\MemoryConfigCollection)) #4 /opt/silverstripe/framework/src/Core/Config/CoreConfigFa in /opt/silverstripe/vendor/silverstripe/config/src/Transformer/YamlTransformer.php on line 214

I also tried to avoid tidy support warning with sudo apt install php-tidy but the warning stills there.

Thanks!

[tractorcow]

Hi @GustavoMarcante do you have multiple files in mysite/_config? If so, can you please tell me if there are multiple Name: mysite files there? If not, this error may be a false negative we need to fix.

[tractorcow]

@GustavoMarcante I've created a patch that doesn't fix the issue, but it will report the location of any conflicted files.

silverstripe/silverstripe-config#19

Would you be able to please copy this code into your local install and tell me what kind of error you're encountering?

[tractorcow]

I've found the issue... the second mysite is coming from the installer.

[tractorcow]

Fix at silverstripe/recipe-core#2

[GustavoMarcante]

@tractorcow I tried to update using composer update (updated some files) and then browsing to localhost/silverstripe/install.php again, but the same error happened.
I also tried a new install with no success in fixing.
Am I missing something?

[GustavoMarcante]

In /mysite/_config I have
config.yml
mysite.yml
theme.yml

I looked /vendor/silverstripe/config/src/Transformer/YamlTransformer.php and mysite/_config/mysite.yml and the changes of silverstripe/silverstripe-config#19 and https://github.com/silverstripe/recipe-core/pull/2/files were not there (yet). I changed it manually, but I had no effect.

[tractorcow]

One more fix at #7235 will prevent that unnecessary third config file. ;)