utf-8 codec can't decode byte 0xc6 in position 11 - invalid continuation byte

Hi,

I'm trying to configure qgis-otb-plugin on Windows, with QGIS 3.4.4, and any time I try to run any algorithm, I get:

'utf-8' codec can't decode byte 0xc6 in position 11: invalid continuation byte

Processing algorithm…
Algorithm 'KMeansClassification' starting…
Input parameters:
{ 'in' : 'D:/orto_teste.tif', 'out' : 'C:/Users/pedro.venancio/AppData/Local/Temp/processing_236fe621ba134153819a22e0c27c2f1f/9bc6f259fe314b4780ac77ba6c4d8de6/out.tif', 'nc' : 5, 'ts' : 100, 'maxit' : 1000, 'outmeans' : 'C:/Users/pedro.venancio/AppData/Local/Temp/processing_236fe621ba134153819a22e0c27c2f1f/eacdb2c079a042f1918d40b2e9a81354/outmeans.file', 'sampler' : 'periodic', 'sampler.periodic.jitter' : 0, 'vm' : None, 'nodatalabel' : 0, 'cleanup' : True, 'rand' : 0, 'outputpixeltype' : 5 }

'utf-8' codec can't decode byte 0xc6 in position 11: invalid continuation byte
Execution completed in 0.70 seconds

Results:
{'out': 'C:/Users/pedro.venancio/AppData/Local/Temp/processing_236fe621ba134153819a22e0c27c2f1f/9bc6f259fe314b4780ac77ba6c4d8de6/out.tif',
'outmeans': 'C:/Users/pedro.venancio/AppData/Local/Temp/processing_236fe621ba134153819a22e0c27c2f1f/eacdb2c079a042f1918d40b2e9a81354/outmeans.file'}

Loading resulting layers
The following layers were not correctly generated.<ul><li>C:/Users/pedro.venancio/AppData/Local/Temp/processing_236fe621ba134153819a22e0c27c2f1f/9bc6f259fe314b4780ac77ba6c4d8de6/out.tif</li></ul>You can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.

Log message shows:

2019-02-25T10:57:13 INFO cmd="C:\Users\pedro.venancio\AppData\Roaming\QGIS\QGIS3\profiles\default\processing\qgis_otb_cli.bat" KMeansClassification C:\OSGeo4W64\OTB-6.6.0-Win64\lib\otb\applications -cleanup True -in "D:\orto_teste.tif" -maxit 1000 -nc 5 -sampler "periodic" -ts 100 -out "C:/Users/pedro.venancio/AppData/Local/Temp/processing_236fe621ba134153819a22e0c27c2f1f/9bc6f259fe314b4780ac77ba6c4d8de6/out.tif" -outmeans "C:/Users/pedro.venancio/AppData/Local/Temp/processing_236fe621ba134153819a22e0c27c2f1f/eacdb2c079a042f1918d40b2e9a81354/outmeans.file"

The environment is like this:

:: Setup environment for OTB package. Generated by QGIS plugin
SET LC_NUMERIC=C
SET GDAL_DRIVER_PATH=disable
SET GDAL_DATA="C:\OSGeo4W64\OTB-6.6.0-Win64\share\data"
SET GEOTIFF_CSV="C:\OSGeo4W64\OTB-6.6.0-Win64\share\epsg_csv"
SET OTB_LOGGER_LEVEL=INFO
SET OTB_APPLICATION_PATH="C:\OSGeo4W64\OTB-6.6.0-Win64\lib\otb\applications"
"C:\OSGeo4W64\OTB-6.6.0-Win64\bin\otbApplicationLauncherCommandLine.exe" %*

I've already tried with OTB 6.6.0 and 6.6.1, with same results.

Running OTB algorithms from Monteverdi Application Launcher works as expected.

am I missing something?

Thanks!