Root causes
- A numeric value is used directly where Pine v6 requires a `bool`.
- A v5 script relied on implicit numeric-to-Boolean conversion before migration.
- A function returns `int`, `float`, or another type instead of the intended condition.
Compilation errorCE10101
Fix CE10101: `if` condition must evaluate to `bool`
Make the `if` condition return an explicit Boolean value. Pine Script v6 does not implicitly convert numeric values to `bool`, so an integer returned by `ta.change(dayofmonth)` cannot control the block directly. Compare it with zero, use another Boolean expression, or apply the appropriate `na` test. Here, `change != 0` states the intended new-day condition without relying on legacy conversion.
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Before and after
Make the smallest reviewable change
Both artifacts include the version declaration and the code needed to inspect the stated problem. The diff lists the lines that change between them.
Broken code.pine
//@version=6
indicator("Boolean condition demo")
int change = ta.change(dayofmonth)
bool isNewDay = false
if change
isNewDay := true
plot(isNewDay ? 1 : 0)Fixed code.pine
//@version=6
indicator("Boolean condition demo")
int change = ta.change(dayofmonth)
bool isNewDay = false
if change != 0
isNewDay := true
plot(isNewDay ? 1 : 0)Diff.pine
--- broken.pine
+++ fixed.pine
@@
-if change
+if change != 0How the fix was verified
- Method
- Pineify UAT grammar checker via check-pine-script-grammar.mjs
- Broken result
- Returned the Boolean-condition diagnostic at line 5.
- Fixed result
- Returned no grammar diagnostics.
- Limit
- The comparison compiles and expresses a nonzero change. Confirm that this is the intended event condition.
Official TradingView references
Related Pine Script error guides
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Compiler warning
Fix CW10003: function should be called on each calculation
Compilation error
Fix `plot()` in local scope
Bring the actual script, not just the message
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