Hi, maybe someone can help me, when I try "docker/sdk up" than I get following error message:

PHP Fatal error:  Uncaught Exception: Could not resolve path to vendor/autoload.php in /data/vendor/spryker/install/bin/install:17
Stack trace:
#0 {main}
  thrown in /data/vendor/spryker/install/bin/install on line 17

Fatal error: Uncaught Exception: Could not resolve path to vendor/autoload.php in /data/vendor/spryker/install/bin/install:17
Stack trace:
#0 {main}
  thrown in /data/vendor/spryker/install/bin/install on line 17

how can I solve this issue?

You are sure the composer install has run successfully? If not look what issue has been shown during the container build when composer install was executed.