egametang/ET · error · Exception

condition node params field not found: {node.GetType().FullN

Error message

condition node params field not found: {node.GetType().FullName}.Params

What it means

Thrown by SetParamsField when a condition expression used the parameter-call syntax `NodeName(Param1, Param2)` (the dedicated condition node form) but the selected node type has no public instance field named `Params`. Per AGENTS.md, only nodes that declare `public string[] Params` may use parenthesized parameters.

Source

Thrown at Packages/cn.etetet.conditionexpr/Scripts/Model/Share/ConditionExprParser.cs:302

            if (fieldInfo == null)
            {
                throw new Exception($"condition node owner key field not found: {node.GetType().FullName}.{nameof(BTNumericCompare.OwnerKey)}");
            }

            if (fieldInfo.FieldType != typeof(string))
            {
                throw new Exception($"condition node owner key field must be string: {node.GetType().FullName}.{nameof(BTNumericCompare.OwnerKey)}");
            }

            fieldInfo.SetValue(node, ownerKey);
        }

        private void SetParamsField(BTCondition node, string[] paramValues)
        {
            FieldInfo fieldInfo = node.GetType().GetField("Params", BindingFlags.Instance | BindingFlags.Public);
            if (fieldInfo == null)
            {
                throw new Exception($"condition node params field not found: {node.GetType().FullName}.Params");
            }

            if (fieldInfo.FieldType != typeof(string[]))
            {
                throw new Exception($"condition node params field must be string[]: {node.GetType().FullName}.Params");
            }

            fieldInfo.SetValue(node, paramValues);
        }

        private void AddSequenceChild(BTSequence sequence, BTNode child)
        {
            if (child is BTSequence childSequence)
            {
                sequence.Children.AddRange(childSequence.Children);
                return;
            }

View on GitHub (pinned to 5cab01f7a8)

Solutions

1. Add `public string[] Params;` to the node class if it is meant to accept parameters.
2. If the node is not parameterized, remove the parenthesized arguments from the expression and reference it in the bare form.

Example fix

// before
[ConditionVariable("Distance")]
public class DistanceNode : BTCondition { /* no Params */ }
// used as: Distance(Friend1) > 0
// after
[ConditionVariable("Distance")]
public class DistanceNode : BTCondition
{
    public string[] Params;
}

static bool HasParamsField(Type t) =>
    t.GetField("Params", BindingFlags.Instance | BindingFlags.Public) != null;

When it happens

Trigger: Writing `HP(Friend1) > 0` against a node that has no Params field; registering a dedicated condition node and forgetting the Params field; renaming it to `Args`.

Common situations: Designer assumes any node accepts parameters and writes `NodeName(target)`; a custom node author copies a numeric-compare node template that lacks Params.

Related errors

• condition node field not found: {node.GetType().FullName}.{f
• condition node owner key field not found: {node.GetType().Fu
• condition node owner key field must be string: {node.GetType
• condition node params field must be string[]: {node.GetType(
• condition variable node create error: {nodeType.FullName}

AI-assisted analysis of egametang/ET@5cab01f7a8 (2026-08-13). Data as JSON: /api/errors/c21db09744a86126. Report an issue: GitHub.