Failed to restore indicator

[Ralph]

07.02.2009 11:11:44|3|4|Failed to restore indicator 'NinjaTrader.Indicator.MarketProfile'. Most likely (a) the implementation changed or (b) one or more properties have been renamed or removed or (c) the custom assembly which implements this indicator no longer is there.

Hi,

After loading NT I get the error message above. It has to do with applying an self-written indicator to a chart in the default workspace. This indicator doesn't load after re-invocation of NT. I did the following to get rid of that message:

- Compiled the indicator after last modification.
- Saved all workspaces

But that doesn't solve the problem. The message disappears only when I either delete the indicator from the chart or remove the default workspace xml setup from the workspaces-directory.

Any idea how proceed?

Regards
Ralph

[NinjaTrader_Ben]

Hello,

It sounds like there is something wrong with the indicator. Post it and I will test it for you.

[Ralph]

Testcase

Hi Ben,

attached you could find a testcase. It is just a framework of the indicator but it "works" on my side. Please load it to a chart, save the workspace, quit and restart NT. Then I can see the concerning message in the log tab and the indicator is not reloaded to the chart.

Regards
Ralph

[NinjaTrader_Ben]

Hello,

The same thing happened to me. Something is wrong with the indicator. I suggest commenting things out until it works, to find the issue.

[NinjaTrader_Dierk]

Unfortunately this is beyond the level we can provide support for.

Hint: NT indicators are XML serialized. I noticed several public properties having non xml-serializable types like Color, ProfileBaseTest, TimeSpan etc. You need to clear those out e.g. by using concepts like PaintColorSerializable here: http://www.ninjatrader-support2.com/...ead.php?t=4977

[Ralph]

I understand the point, thanks a lot Dierk.

Regards
Ralph

[Ralph]

The error message mentioned in my first post was caused by a public property which I defined for a class instance. This instance was not prepared for serialization because it was not intended to be serialized. Applying the attribute [XmlIgnore()] to this property solved the issue.

Regards
Ralph

[NinjaTrader_Bertrand]

Thanks for sharing this Ralph, great you got it resolved.

[funk101]

re: Serialization Error

Yeah, I'm getting this error as well. I checked out the SampleColorInput.zip. Does this mean that ALL my variables need to have the XmlIgnore, ...Serialize, , etc. in the Properties region?

[Ralph]

Not for all, because C# provides type converters for the basic types and the compiler applies them automatically. More complex types (Dierk gives some examples in his reply) you need to serialize by your own.

Regard
Ralph

[funk101]

hmm, well let's see, I have a couple of homegrown classes. I'm utilizing a Dictionary Collection, a List<>. Most of what I have I don't want to be editable in properties window, ie: [Category("Parameters")]. Is there any documentation on what are my other choices? And I guess I have to keep "serializing" until I don't get the error any more.

[Ralph]

...And I guess I have to keep "serializing" until I don't get the error any more.

No, fortunately not. Serialisation is desired only, if you would like to store the property's context somewhere else (xml file) in text format. You need to deal with 2 attributes only, they are described on the MS C#-webpage:

[XmlIgnore()] - don't serialize during runtime
[Browsable(false)] - don't display in the property grid

Regards
Ralph