Valkyrien Skies & Supplementaries Crash On /reload: Fix

Experiencing a crash when using the /reload command with Valkyrien Skies and Supplementaries mods in Minecraft can be frustrating. This comprehensive guide breaks down the issue, explores potential causes, and provides steps to troubleshoot and resolve the problem. If you're encountering this specific crash, you're in the right place.

Understanding the Issue: Valkyrien Skies and Supplementaries Mod Conflict

If you're experiencing crashes when using the /reload command in Minecraft with Valkyrien Skies and Supplementaries mods installed, you're not alone. This issue, specific to the combination of these mods, manifests as a game crash during the server reload process. The error logs often point to a tick phase issue and a ConstraintFailedException, indicating a conflict in how the mods handle the game's ticking system and resource loading.

When you use the /reload command, the server attempts to refresh its data, including recipes, advancements, and other resources. This process involves multiple stages, or "ticks," during which different aspects of the game are updated. Valkyrien Skies, known for its dynamic airship mechanics, and Supplementaries, which adds a variety of building blocks and features, both interact with these ticks in complex ways. The crash occurs when their interactions become unsynchronized or violate certain constraints imposed by the game's engine or the mods themselves. The core problem lies in the mods' interaction during the resource reloading process, particularly when certain game events, like TagsUpdatedEvent, are triggered. This event is crucial for both mods, as it allows them to update their internal data based on changes in the game's tag system (a way of categorizing items, blocks, etc.). However, the way each mod handles this event can create a conflict, leading to the crash.

The error message Constraints failed. Stages since last reset: further illustrates this problem. It indicates that Valkyrien Skies has specific requirements for the order in which game ticks occur. When Supplementaries is also installed, the sequence of these ticks gets disrupted, violating the constraints set by Valkyrien Skies. This violation triggers the ConstraintFailedException and subsequently crashes the game. The log excerpt clearly shows the sequence of events leading to the crash. It begins with the server initiating the reload process ([Valunthir: Reloading!]) and the subsequent resource generation by Moonlight (a library mod often used by Supplementaries). The errors related to recipe loading and advancement parsing highlight potential inconsistencies in data handling during the reload. The critical point is the Exception caught during firing event: Constraints failed, which confirms the tick phase conflict. The stack trace further pinpoints the origin of the error within the Valkyrien Skies code, specifically in the TickStageEnforcerImpl and ShipObjectServerWorld classes, which manage the physics and dimensions of airships. This suggests that the crash is related to how the mod handles its dynamic ship entities during a reload. Addressing this issue requires a coordinated effort from the mod developers of both Valkyrien Skies and Supplementaries to identify the root cause of the conflict and implement a solution that ensures compatibility during server reloads. In the meantime, players can avoid using the /reload command as a temporary workaround to prevent these crashes. It's also essential to keep both mods updated to their latest versions, as future updates may include fixes for this compatibility issue.

Identifying the Root Cause

Before diving into solutions, it's important to understand what might be causing this crash. Based on the provided information and error logs, here are the key factors:

• Mod Conflict: The core issue appears to be a conflict between Valkyrien Skies and Supplementaries during the server reload process.
• Tick Phase Issue: The error logs mention a