Image width problem when tracking pixel buffer image

Hi,

I'm trying to track image from pixel buffer (C API), according to this guide: [quote]https://library.vuforia.com/objects/image-targets-api-overview

You can also choose to create an Image Target Observer from an image pixel buffer. To do this, the VuImageTargetBufferConfig needs to be configured with a pixelBuffer, bufferFormat, bufferSize, and targetName.[/quote]

my code: VuImageTargetBufferConfig imageTargetBufferConfig = vuImageTargetBufferConfigDefault(); imageTargetBufferConfig.pixelBuffer = bitmap; imageTargetBufferConfig.bufferFormat = VU_IMAGE_PIXEL_FORMAT_RGBA8888; imageTargetBufferConfig.bufferSize.data[0] = 3498; // bytes per row from AndroidBitmapInfo imageTargetBufferConfig.bufferSize.data[1] = 2266; // image height in pixels imageTargetBufferConfig.targetName = "mytarget"; VuImageTargetBufferCreationError creationError; if (vuEngineCreateImageTargetObserverFromBufferConfig(mEngine, &mObjectObserver, &imageTargetBufferConfig, &creationError) != VU_SUCCESS) {     LOG("Error creating image target observer: 0x%02x", creationError);     mShowErrorCallback("Error creating image target observer");     return false; }

produces error:

E/AR: Target width must be positive I/Vuforia: Error creating image target observer: 0x07

i'm trying to add target width to VuImageTargetBufferConfig:

imageTargetBufferConfig.targetWidth = 1.0f; // i tried various values

getting new error:

E/AR: Unable to set the RuntimeImageSource. The target width cannot be 0 or smaller. A/libc: Fatal signal 11 (SIGSEGV), code 2 (SEGV_ACCERR), fault addr 0x7c8b98e000 in tid 14989 (DefaultDispatch), pid 14643 (app)

Could you give me some hints, or provide some examples of tracking image from pixel buffer? Having this error with 10.3.2 and 10.4.4 versions of vuforia SDK