Your requirements could not be resolved to an installable set of packages.
Problem 1
- horde/exception[dev-FRAMEWORK_6_0, v3.0.0alpha4] require horde/translation ^3 || dev-FRAMEWORK_6_0 -> found horde/translation[dev-FRAMEWORK_6_0, 3.0.0alpha1, v3.0.0alpha2] but it does not match your minimum-stability.
- horde/exception[3.0.0alpha1, ..., v3.0.0alpha3] require horde/translation ^3 -> found horde/translation[3.0.0alpha1, v3.0.0alpha2] but it does not match your minimum-stability.
- Root composer.json requires horde/exception ^3 || dev-FRAMEWORK_6_0 -> satisfiable by horde/exception[dev-FRAMEWORK_6_0, 3.0.0alpha1, 3.0.0alpha2, v3.0.0alpha3, v3.0.0alpha4].