Diagnostics

These diagnostics explain script errors and how to correct them.

• C001 — mutation of a frozen value
• C002 — read-only collection passed to a function that changes it
• C003 — collection cannot contain another collection
• C004 — key is missing from a frozen map
• C005 — empty array needs an explicit capacity
• C006 — mutation of a read-only subscription series
• C007 — series cannot be saved or passed here
• I000 — something went wrong while checking this script
• L001 — too many separate stateful calculations
• L002 — struct field limit exceeded
• L003 — user type limit exceeded
• L004 — struct nesting limit exceeded
• L005 — map key is too long
• L006 — subscription declaration limit exceeded
• L007 — collection or series capacity exceeds the supported limit
• L008 — negative collection/series capacity
• L009 — source exceeds the maximum size
• L010 — input declaration limit exceeded
• L011 — plot declaration limit exceeded
• L012 — fill declaration limit exceeded
• L013 — alert declaration limit exceeded
• L014 — alert payload field limit exceeded
• N001 — value may be null here
• N002 — null check on a field or index does not carry over
• N003 — null needs an explicit type
• P001 — unrecognized token
• P002 — unterminated string literal
• P003 — semicolon is not supported
• P004 — legacy logical operator spelling
• P005 — ?? mixed with && or \|\| needs parentheses
• P006 — while is not supported
• P007 — template strings are not supported
• P008 — ?. is not supported
• P009 — postfix ! is not supported
• P011 — top-level statement is not a declaration
• P014 — break and continue are not statements
• P016 — expected token
• P017 — script options block is removed
• P018 — bracket destructuring is not supported
• P019 — loop variables cannot be wrapped in parentheses
• P021 — invalid color literal
• P022 — unknown string escape
• P023 — match arm body statement requires a block
• P024 — match expression arm takes an expression, not a block
• P025 — keyword used as a declaration name
• P026 — ternary broken before ? or :
• P027 — second statement on the same line
• S001 — live value used in setup
• S002 — built-in function cannot run in setup
• S003 — resource must be declared during setup
• S004 — collection with a capacity cannot be a plain setup value
• S005 — collection capacity must be known before the script runs
• S006 — duplicate panel name
• S007 — incorrect declaration
• S008 — user function called in a setup expression
• S009 — state initializer calls a function that needs live data
• S010 — setup value uses a built-in that cannot run in setup
• S011 — setup declaration reads a later-declared binding
• S012 — empty exchange list in subscription
• S013 — color scale needs matching lists with at least two entries
• S014 — color scale positions must be finite and in ascending order
• S015 — minimum trade size must be positive and finite
• S016 — series must be created in a state initializer
• S017 — series history depth must be known before the script runs
• S018 — lambda or collection transform in setup or state initializer
• S019 — alert constructor outside an alert declaration
• S020 — invalid alert payload type
• S021 — trigger must be called on a declared alert
• S022 — trigger argument count does not match the alert's payload
• S023 — trigger result used as a value
• S024 — alert handle re-bound in setup
• S025 — input group cannot be assigned to a variable
• S026 — subscription history cannot be negative
• S027 — the chart subscription cannot be live only
• T001 — unknown identifier
• T002 — duplicate top-level name
• T003 — removed builtin
• T004 — renamed builtin
• T005 — unknown type name
• T006 — local shadows builtin namespace
• T007 — rebinding a visible local or parameter
• T008 — binding a declared type name
• T009 — user type shadows a builtin type name
• T010 — script declaration missing or misplaced
• T011 — duplicate display title
• T012 — diagnostic output truncated
• T013 — unused binding
• T014 — unused subscription
• T015 — script title contains NUL
• T016 — duplicate input key
• T101 — type mismatch
• T102 — operator not defined for operand types
• T103 — float needs an explicit conversion to int
• T104 — nullable collection type
• T105 — array<T> annotation spelling
• T106 — invalid map key type
• T107 — invalid series element type
• T109 — type is not indexable
• T110 — array<T>(n) constructor spelling is removed
• T111 — invalid timeframe literal
• T112 — zero-valued timeframe literal
• T113 — integer literal out of int range
• T114 — invalid session time literal
• T115 — nullable array element type
• T201 — unknown named argument
• T202 — positional argument after named
• T203 — argument is supplied more than once
• T204 — missing argument
• T205 — too many positional values
• T206 — parameter default is not a literal constant
• T207 — required parameter follows an optional parameter
• T208 — null default for non-nullable parameter
• T209 — unsupported number of return types
• T210 — calendar unit literal needs a timeframe or duration context
• T211 — wrong number of return values
• T212 — not all code paths return a value
• T213 — multi-return call outside destructure or tail return
• T214 — destructure target list error
• T215 — no overload matches these arguments
• T216 — value cannot be reassigned
• T217 — invalid assignment target
• T301 — struct field is missing a type annotation
• T302 — struct contains itself
• T303 — type name is not UpperCamel
• T304 — match does not cover every case
• T305 — null case used for a value that cannot be null
• T306 — struct literal field error
• T307 — duplicate field in type declaration
• T401 — function calls itself directly or indirectly
• T402 — stateful calculation inside a loop
• T403 — indicator input mixes timeframes
• T405 — invalid handler for this subscription
• T406 — duplicate handler
• T407 — handler on snapshot source
• T408 — TA source uses a calendar timeframe
• T409 — changing history index needs an explicit series depth
• T410 — indicator over a book or volume view
• T411 — source has no forming view
• T412 — parameter list on a handler for one subscription
• T413 — indicator length must be known before the script runs
• T414 — TA window length out of range
• T415 — plot method does not match the panel
• T416 — invalid str.format template
• T417 — invalid time.format template
• T418 — subscription must refer to one known data source
• T419 — alias must refer directly to one declared scale, window, pane, or alert
• T420 — trade fields are read-only
• T421 — fill boundaries belong to different panes
• T422 — book and profile views only live for the current update
• T423 — profile length must be known before the script runs
• T424 — profile must be read through its own methods
• T425 — solid and gradient colors given to one fill call
• T426 — invalid lambda position or body
• T427 — invalid lambda parameter list
• T428 — stateful calculation, randomness, or drawing inside a lambda
• T429 — lambda changes the collection it is reading
• T430 — collection transform must be a separate statement
• T431 — collection transform on a series
• T432 — save the value in a variable before changing it
• T433 — invalid use of self
• T434 — duplicate method or method/field name collision in a type
• T435 — lambda cannot change its element copy
• T436 — loop or handler variable cannot be reassigned
• T437 — table row cell count differs from the declared column count
• T438 — unsupported table cell value type
• T439 — time coordinate on a pixel-positioned axis
• T440 — fill lines use different kinds of coordinates
• T441 — extension direction does not work with this anchor
• T442 — struct literal does not start with a type name
• T443 — title literal exceeds 256 bytes
• T444 — plot anchor is not a top or bottom edge
• T445 — arrow has a vertical extend mode
• T446 — window field value is not a panel
• T447 — horizontal histogram targets a non-category panel
• T448 — panel is shared between window fields
• T449 — isLast read inside a close handler