guzzle installation problem

[Tsjippy]

I tried to install this but my guzzle is too new:

matteocacciola/php-trello-api 2.0.0 requires guzzlehttp/guzzle ~5.3 -> found guzzlehttp/guzzle[5.3.0, ..., 5.3.4] but the package is fixed to 7.3.0 (lock file version) by a partial update and that version does not match.

Can you fix it?

[darkvovich]

Try to remove composer.lock and try again