Parameter Errors

Parameter errors occur when ctx.param() is called with invalid options.

Error: invalid_param_type

Error: Invalid parameter type "number" for param "period". Expected: int, float, string, boolean

Cause: The type field must be one of the four QSL types.

Fix: Use the correct type name:

// Wrong
ctx.param('period', { type: 'number', default: 14 });
ctx.param('period', { type: 'integer', default: 14 });

// Correct
ctx.param('period', { type: 'int', default: 14 });
ctx.param('threshold', { type: 'float', default: 0.5 });
ctx.param('mode', { type: 'string', default: 'fast' });
ctx.param('useFiler', { type: 'boolean', default: true });

Error: missing_default

Error: Parameter "period" must have a default value

Cause: Every parameter must specify a default value.

Fix:

// Wrong — no default
ctx.param('period', { type: 'int', min: 5, max: 50 });

// Correct
ctx.param('period', { type: 'int', default: 14, min: 5, max: 50 });

Error: invalid_param (range issues)

Error: Parameter "period": default (100) is outside range [5, 50]

Cause: The default value must be between min and max.

Fix: Ensure min <= default <= max:

ctx.param('period', {
  type: 'int',
  default: 14,   // Must be between min and max
  min: 5,
  max: 50,
  step: 1,
});

Error: Step Size Issues

Common problems with step:

// Step must be positive
ctx.param('period', { type: 'int', default: 14, min: 5, max: 50, step: 0 });

// Step should evenly divide the range (or close to it)
// This creates 45/7 ≈ 6.4 steps — some values will be skipped
ctx.param('period', { type: 'int', default: 14, min: 5, max: 50, step: 7 });

// Better — step divides evenly
ctx.param('period', { type: 'int', default: 15, min: 5, max: 50, step: 5 });

Optimization Grid Overflows

If your parameters produce more than 50,000 combinations, optimization will not start. Reduce the grid by:

• Increasing step sizes
• Narrowing min/max ranges
• Setting optimize: false on less important parameters