$ git submodule update --recursive
error: Your local changes to the following files would be overwritten by checkout:
        src/main/java/org/spongepowered/common/data/key/KeyRegistry.java
        src/main/java/org/spongepowered/common/data/manipulator/immutable/common/AbstractImmutableData.java
        src/main/java/org/spongepowered/common/data/manipulator/immutable/entity/ImmutableSpongeHealthData.java
        src/main/java/org/spongepowered/common/data/manipulator/mutable/common/AbstractData.java
        src/main/java/org/spongepowered/common/data/manipulator/mutable/entity/SpongeVelocityData.java
        src/main/java/org/spongepowered/common/data/processor/data/entity/VelocityDataProcessor.java
        src/main/java/org/spongepowered/common/data/processor/value/entity/VelocityValueProcessor.java
        src/main/java/org/spongepowered/common/interfaces/IMixinEntity.java
        src/main/java/org/spongepowered/common/mixin/core/entity/MixinEntity.java
        src/main/java/org/spongepowered/common/registry/SpongeGameRegistry.java
        src/main/java/org/spongepowered/common/text/LegacyTextRepresentation.java
Please, commit your changes or stash them before you can switch branches.
error: The following untracked working tree files would be overwritten by checkout:
        src/main/java/org/spongepowered/common/data/manipulator/immutable/entity/ImmutableSpongeEyeLocationData.java
        src/main/java/org/spongepowered/common/data/manipulator/mutable/entity/SpongeEyeLocationData.java
        src/main/java/org/spongepowered/common/data/processor/data/entity/EyeLocationDataProcessor.java
        src/main/java/org/spongepowered/common/data/processor/value/entity/EyeHeightValueProcessor.java
        src/main/java/org/spongepowered/common/data/processor/value/entity/EyeLocationValueProcessor.java
Please move or remove them before you can switch branches.
Aborting
Unable to checkout 'd3545d8274df2f1a118b63ddef65f10ad1d3902b' in submodule path 'SpongeCommon'