Sitecore 10 SIA Installation Errors

 Non-existent Solr path Error:

Unable to parse [variable('XConnectSolr_Core.Root')] - Exception calling "Evaluate" with "2" argument(s): "The running command stopped because the preference variable "ErrorActionPreference" or common parameter is set to Stop: Unable to parse [joinpath(variable('XConnectSolr_Solr.Server'), variable('XConnectSolr_Xdb.Name'))] - Exception calling "Evaluate" with "2" argument(s): "The running command stopped because the preference variable "ErrorActionPreference" or common parameter is set to Stop: Unable to parse [joinpath(variable('XConnectSolr_Solr.FullRoot'), 'server', 'solr')] - Exception calling "Evaluate" with "2" argument(s): "The running command stopped because the preference variable "ErrorActionPreference" or common parameter is set to Stop: Unable to parse [resolvepath(parameter('XConnectSolr_SolrRoot'))] - Exception calling "InvokeWithContext" with "2" argument(s): "The running command stopped because the preference variable "ErrorActionPreference" or common parameter is set to Stop: Cannot find path 'C:\Solr1\solrSolr-8.4.0' because it does not exist.""""