I get this error when trying to carry out segmentationenter image description here
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this is quite new to me, so I've been trying to make it work for the past few days, but keep getting errors.
I'm trying to create a strategy code for several indicator, but get "Could not find function or function reference 'sma'" error or it compiles perfectly but get no data on the overview pane...
I decided to try the most basic code to see what happens:
strategy("Simple Moving Average Strategy", overlay=true)
// Define the moving average
ma = sma(close, 20)
// Buy signal
strategy.entry("Buy", strategy.long, when=crossover(close, ma))
// Sell signal
strategy.exit("Sell", when=crossunder(close, ma))
This yields no data.
can someone please assist?
also, if you guys can explain why I get "Could not find function or function reference 'sma'" (or other functions) eventhough the rest of the code is just fine, that would be great.
Thanks!
Tried reducing the code to its basics, to pinpoint the error.
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I'm trying to access specific parts of the following website, but I keep getting this error message instead.
Error thrown
Call to undefined function simple_fields_get_post_group_values()
Does anyone know why I am getting this, and if this can be fixed? Thank you.
ERROR TypeError: Cannot read property 'x' of undefined
does anyone know y this error keeps appearing. Initially graph was working fine but suddenly it started showing this error and below that error i am seeing this error:
"ERROR TypeError: Array.prototype.find called on null or undefined"
Please let me know how to resolve this issue, Thanks in advance
Please find image attached
Found solution. Array which is used for series has an undefined value in it then error appears. pass null or 0 instead of undefined and graphs works properly.
I have an iOS application written in Swift 2 in Xcode 8.2.1, that's built for iOS 10.2.
I've had a number of crash reports from TestFlight and despite symbolication, none of the crash logs show any program state besides the stack-traces (no argument values, no locals, no heap objects, etc).
...but inside those functions I can see code which is likely to fail (e.g. a forced unwrap) but the crash log isn't telling me where or why it's failing.
When debugging in Xcode, I can use fatalError(message: String) where I can put my own message like "functionFoo returned nil" or "variable bar == \"" + bar + "\"", except when deployed using TestFlight or the App Store the fatalError will be hit and the program terminates, but the message value is not saved to the crash log, making it pointless.
In other environments, like C#/.NET and Java I can simply throw new SomeExceptionType("my message") and all information is available in whatever global catch(Exception) handler I have.
How can I achieve the same goal in iOS / Swift?
Swift does support error handling. You can create your own error type by confirming to Error protocol or use existing error types and then throw an error by invoking throw error.
But Swift forces you add error handling to any code that can throw an error. There are multiple way you can handle error in swift.
Apply throws keyword to your function, this indicates that the function can throw an error when invoked and the error should be handled by the caller.
func canThrowErrors() throws -> String
When invoking methods with throws keyword you have to add try keyword at the beginning of the invocation. All these try invocations should be handled either by applying throws to method to just propagate the errors or wrapping inside a do-catch block:
do {
try canThrowErrors()
try canThrowOtherErrors()
} catch is SpecificError {
// handling only specific error type
} catch let error as SpecificError {
// catches only specific error for type
} catch {
// catches all errors
}
Additionally you can use try? and try! for throwing function invocation to disable error propagation and retrieve optional result that returns nil in case of error and runtime assertions respectively.
By forcing you to handle all the errors at compile time swift avoids any undefined runtime behavior and debugging nightmare.
I would suggest to use fatalError or any other runtime assertion only if scenarios when there is no way to recover from a state without crashing the app. Unfortunately, there is no way to handle errors from fatalError as its use is only reserved for such scenarios only. Also, in your crashlog you will only get the line number that caused the crash to get additional info for the cause of crash I would suggest to use custom logging or analytics.
I am using strict.lua in a cocos2d-x project under Xcode. When I get an error it doesn't tell me where the error occurred. I just get an error message like:
cocos2d: LUA ERROR: attempt to call a number value
PANIC: unprotected error in call to Lua API (...<folder>/strict.lua:30: attempt to index a nil value)
How can I get strict.lua to tell me where the error occurred or give me a call stack?
(Note putting print(debug.traceback()) in strict.lua doesn't work)