The SCS Software Modding Wiki has no explanation for these errors ERROR , ERROR . It's only up to ERROR  I hope that this problem will be resolved soon. SCS Workshop Uploader needs updating. Thank you all for your answers.
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ERROR  (/latest.zip/def/vehicle/truck/volvo.fh16_2012/transmission/tc10.sii): [unit] The unit 'tc10.volvo.fh16_2012.transmission' of type 'accessory_transmission_data' has no attribute named 'sound_retarder'. ERROR  (/latest.zip/def/vehicle/truck/volvo.fh16_2012/transmission/tc10.sii): Failed to load units from file.