Diagnose Pine Script compile errors with a clean strategy

A clean Pine Script v6 strategy to start from

Create a new strategy in Pine Editor and replace its entire contents with this example. It calculates two EMAs on every bar, enters long on a crossover, and requests a close on a crossunder. There are no external data requests, libraries, date filters, or stop orders to complicate the first check. This is a diagnostic baseline, not a trading recommendation.

• Save and add the script to a standard candlestick chart. Confirm that both EMA plots appear.
• The green marker shows the crossover condition, not a confirmed fill. With default settings, market orders normally fill on the next available tick, typically the next bar open in a historical test.
• No trades can still be legitimate: the loaded history may contain no qualifying crossover, or one unit may exceed available capital for the symbol and its contract multiplier.
• The final source passed the Pineify syntax checker on October 16, 2026. Chart execution and trade results were not measured for this page.
• A successful baseline check does not certify your account, data feed, or full strategy. Keep the original script for comparison.

//@version=6
strategy("Clean compile diagnostic", overlay = true, initial_capital = 100000, default_qty_type = strategy.fixed, default_qty_value = 1)

fastLength = input.int(9, "Fast EMA", minval = 1)
slowLength = input.int(21, "Slow EMA", minval = 1)
fastEma = ta.ema(close, fastLength)
slowEma = ta.ema(close, slowLength)
enterLong = ta.crossover(fastEma, slowEma)
exitLong = ta.crossunder(fastEma, slowEma)

if enterLong and strategy.position_size == 0
    strategy.entry("Long", strategy.long)
if exitLong and strategy.position_size > 0
    strategy.close("Long")

plot(fastEma, "Fast EMA", color = color.blue)
plot(slowEma, "Slow EMA", color = color.orange)
plotshape(enterLong, title = "Entry condition", style = shape.triangleup, location = location.belowbar, color = color.green)

Compile error, runtime error, or no trades?

Record the exact message and where it appears before editing. The same symptom, such as an empty chart or an empty Strategy Tester, can arise at different stages.

An isolation order that preserves useful evidence

Work in a duplicate and change one complete block at a time. Randomly deleting lines can create new missing-variable errors and hide the original cause. This procedure is reproducible, but it is not a measured speed benchmark.

• Capture the exact diagnostic, line number, Pine version, and full source. Start with the first error; later messages may depend on it.
• Check the marked line and the preceding statement for an unmatched quote, parenthesis, bracket, or missing block indentation.
• Compile the standalone example above in a fresh document. Do not paste a second strategy() or indicator() declaration into the existing script.
• Restore inputs and calculations first, then conditions, order calls, and visual output. Save after each complete block and retain the last compiling revision.
• When a restored block fails, compare it with the last compiling revision, including names and types it depends on. Use // comments or the editor comment shortcut to disable complete lines; Pine does not use /* ... */ block comments.
• After compilation succeeds, inspect chart values and orders on the same symbol, timeframe, inputs, and date range as the original intended behavior.

Five checks for a generic compiler message

These are diagnostic categories, not a ranking of error frequency. Check the function reference and the compiler message before applying a fix.

Why replacing a dynamic length can change the strategy

The example uses input.int() values, whose input qualifier is accepted by ta.ema(). A length computed from changing prices has a series qualifier; casting that number to int does not make it simple. If the intended algorithm requires an adaptive EMA, replacing its length with a constant is a design change. Choose an implementation that supports the intended calculation and compare its outputs.

• Read the specific function signature instead of assuming every length parameter has the same requirements.
• A syntax repair should state any change to indicator periods, signal timing, state persistence, position size, or exits.
• A compiling script can still repaint, place unexpected orders, or calculate the wrong signal. Verify those behaviors on the chart.

What to send an AI Pine Script error fixer

Pineify has a syntax-checking tool in its coding workflow. Ask explicitly to check the completed code, and retain the returned diagnostics. A suggestion or rewritten script is not itself evidence of a successful check.

• Provide the complete editable source and exact compiler message, including the line and column when available.
• Specify the Pine version, indicator or strategy declaration, symbol, timeframe, and expected result.
• Ask for the smallest repair, an explanation of changed behavior, and a syntax check of the final full script.
• If a check times out or the service fails, treat the result as unverified and retry. Compile in TradingView and inspect chart behavior before relying on the revision.