[Qgis-user] Merging vectorlayers

[Moussadji Bekale Dehn Randy]

hi!!! how it is goin'? 
I try to merge vector layers using pyQgis. 

import processing as pr 
layer=QgsProject.instance().mapLayers() 

lay=[ly for ly in layer.values()] 
pr.run("qgis:mergevectorlayers",lay,"output.shp") 
Traceback (most recent call last): 
File "C:\PROGRA~1\QGIS3~1.4\apps\Python37\lib\code.py", line 90, in runcode 
exec(code, self.locals) 
File "<input>", line 1, in <module> 
File "C:/PROGRA~1/QGIS3~1.4/apps/qgis-ltr/./python/plugins\processing\tools\general.py", line 105, in run 
return Processing.runAlgorithm(algOrName, parameters, onFinish, feedback, context) 
File "C:/PROGRA~1/QGIS3~1.4/apps/qgis-ltr/./python/plugins\processing\core\Processing.py", line 135, in runAlgorithm 
ok, msg = alg.checkParameterValues(parameters, context) 
TypeError: QgsProcessingAlgorithm.checkParameterValues(): argument 1 has unexpected type 'list' 
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