I am trying to upgrade my solution from 7.15.9 to 8.1.1, I have previously tried 8.5.5 and a few other versions below 8.6, but none seem to work. I always end up with the same error, and I have not found a way to fix it or any workarounds in the forum. These are my logs, would appreciate any help.

{"@t":"2023-02-21T15:10:10.7485985Z","@mt":"The database schema validation produced the following summary: {DbSchemaSummary}","DbSchemaSummary":"The following tables were found in the database, but are not in the current schema:\r\ncmsContent,cmsContentVersion,cmsContentXml,cmsDataType,cmsDataTypePreValues,cmsDocument,cmsMedia,cmsPreviewXml,cmsPropertyData,cmsTask,cmsTaskType,Redirects,umbracoDomains,umbracoMigration,umbracoContent,umbracoContentVersion,umbracoMediaVersion,umbracoDocument,umbracoDataType,umbracoDomain,umbracoPropertyData,cmsContentNu,umbracoDocumentVersion,umbracoKeyValue,umbracoContentVersionCultureVariation,umbracoDocumentCultureVariation,umbracoContentSchedule\r\n \r\nThe following columns were found in the database, but are not in the current schema:\r\ncmsContent,pk,cmsContent,nodeId,cmsContent,contentType,cmsContentVersion,id,cmsContentVersion,ContentId,cmsContentVersion,VersionId,cmsContentVersion,VersionDate,cmsContentXml,nodeId,cmsContentXml,xml,cmsDataType,pk,cmsDataType,nodeId,cmsDataType,propertyEditorAlias,cmsDataType,dbType,cmsDataTypePreValues,id,cmsDataTypePreValues,datatypeNodeId,cmsDataTypePreValues,value,cmsDataTypePreValues,sortorder,cmsDataTypePreValues,alias,cmsDocument,nodeId,cmsDocument,published,cmsDocument,documentUser,cmsDocument,versionId,cmsDocument,text,cmsDocument,releaseDate,cmsDocument,expireDate,cmsDocument,updateDate,cmsDocument,templateId,cmsDocument,newest,cmsMacro,macroScriptType,cmsMacro,macroScriptAssembly,cmsMacro,macroXSLT,cmsMacro,macroPython,cmsMedia,nodeId,cmsMedia,versionId,cmsMedia,mediaPath,cmsPreviewXml,nodeId,cmsPreviewXml,versionId,cmsPreviewXml,timestamp,cmsPreviewXml,xml,cmsPropertyData,id,cmsPropertyData,contentNodeId,cmsPropertyData,propertytypeid,cmsPropertyData,dataInt,cmsPropertyData,dataDecimal,cmsPropertyData,dataDate,cmsPropertyData,dataNvarchar,cmsPropertyData,dataNtext,cmsPropertyData,versionId,cmsTags,ParentId,cmsTask,closed,cmsTask,id,cmsTask,taskTypeId,cmsTask,nodeId,cmsTask,parentUserId,cmsTask,userId,cmsTask,DateTime,cmsTask,Comment,cmsTaskType,id,cmsTaskType,alias,cmsTemplate,design,Redirects,Id,Redirects,IsRegex,Redirects,OldUrl,Redirects,NewUrl,Redirects,LastUpdated,Redirects,Notes,umbracoDomains,id,umbracoDomains,domainDefaultLanguage,umbracoDomains,domainRootStructureID,umbracoDomains,domainName,umbracoMigration,id,umbracoMigration,name,umbracoMigration,createDate,umbracoMigration,version,cmsContentType,isElement,cmsContentType,variations,umbracoContent,nodeId,umbracoContent,contentTypeId,umbracoContentVersion,id,umbracoContentVersion,nodeId,umbracoContentVersion,versionDate,umbracoContentVersion,userId,umbracoContentVersion,current,umbracoContentVersion,text,umbracoMediaVersion,id,umbracoMediaVersion,path,umbracoDocument,nodeId,umbracoDocument,published,umbracoDocument,edited,umbracoDataType,nodeId,umbracoDataType,propertyEditorAlias,umbracoDataType,dbType,umbracoDataType,config,umbracoLanguage,isDefaultVariantLang,umbracoLanguage,mandatory,umbracoLanguage,fallbackLanguageId,umbracoDomain,id,umbracoDomain,domainDefaultLanguage,umbracoDomain,domainRootStructureID,umbracoDomain,domainName,umbracoLog,entityType,umbracoLog,parameters,cmsMacro,macroSource,cmsMacro,macroType,cmsPropertyType,variations,umbracoPropertyData,id,umbracoPropertyData,versionId,umbracoPropertyData,propertyTypeId,umbracoPropertyData,languageId,umbracoPropertyData,segment,umbracoPropertyData,intValue,umbracoPropertyData,decimalValue,umbracoPropertyData,dateValue,umbracoPropertyData,varcharValue,umbracoPropertyData,textValue,cmsTags,languageId,umbracoRedirectUrl,culture,cmsContentNu,nodeId,cmsContentNu,published,cmsContentNu,data,cmsContentNu,rv,umbracoDocumentVersion,id,umbracoDocumentVersion,templateId,umbracoDocumentVersion,published,umbracoKeyValue,key,umbracoKeyValue,value,umbracoKeyValue,updated,umbracoContentVersionCultureVariation,id,umbracoContentVersionCultureVariation,versionId,umbracoContentVersionCultureVariation,languageId,umbracoContentVersionCultureVariation,name,umbracoContentVersionCultureVariation,date,umbracoContentVersionCultureVariation,availableUserId,umbracoDocumentCultureVariation,id,umbracoDocumentCultureVariation,nodeId,umbracoDocumentCultureVariation,languageId,umbracoDocumentCultureVariation,edited,umbracoDocumentCultureVariation,available,umbracoDocumentCultureVariation,published,umbracoDocumentCultureVariation,name,umbracoContentSchedule,id,umbracoContentSchedule,nodeId,umbracoContentSchedule,languageId,umbracoContentSchedule,date,umbracoContentSchedule,action\r\n \r\nThe following constraints (Primary Keys, Foreign Keys and Indexes) were found in the database, but are not in the current schema:\r\nFK_cmsContent_cmsContentType_nodeId,FK_cmsContent_umbracoNode_id,FK_cmsContentVersion_cmsContent_nodeId,FK_cmsContentXml_cmsContent_nodeId,FK_cmsDataType_umbracoNode_id,FK_cmsDataTypePreValues_cmsDataType_nodeId,FK_cmsDocument_cmsContent_nodeId,FK_cmsDocument_cmsTemplate_nodeId,FK_cmsDocument_umbracoNode_id,FK_cmsMedia_cmsContent_nodeId,FK_cmsMedia_umbracoNode_id,FK_cmsMember_cmsContent_nodeId,FK_cmsMember_umbracoNode_id,FK_cmsPreviewXml_cmsContent_nodeId,FK_cmsPreviewXml_cmsContentVersion_VersionId,FK_cmsPropertyData_cmsPropertyType_id,FK_cmsPropertyData_umbracoNode_id,FK_cmsPropertyType_cmsDataType_nodeId,FK_cmsTags_cmsTags,FK_cmsTask_cmsTaskType_id,FK_cmsTask_umbracoNode_id,FK_cmsTask_umbracoUser,FK_cmsTask_umbracoUser1,FK_umbracoDomains_umbracoNode_id,FK_umbracoNode_umbracoUser_id,FK_umbracoContent_umbracoNode_id,FK_umbracoContent_cmsContentType_NodeId,FK_umbracoContentVersion_umbracoContent_nodeId,FK_umbracoContentVersion_umbracoUser_id,FK_umbracoMediaVersion_umbracoContentVersion_id,FK_umbracoDocument_umbracoContent_nodeId,FK_umbracoDataType_umbracoNode_id,FK_umbracoLanguage_umbracoLanguage_id,FK_umbracoDomain_umbracoNode_id,FK_umbracoLog_umbracoUser_id,FK_cmsMember_umbracoContent_nodeId,FK_cmsPropertyType_umbracoDataType_nodeId,FK_umbracoPropertyData_umbracoContentVersion_id,FK_umbracoPropertyData_cmsPropertyType_id,FK_umbracoPropertyData_umbracoLanguage_id,FK_cmsTags_umbracoLanguage_id,FK_cmsContentNu_umbracoContent_nodeId,FK_umbracoDocumentVersion_umbracoContentVersion_id,FK_umbracoDocumentVersion_cmsTemplate_nodeId,FK_umbracoContentVersionCultureVariation_umbracoContentVersion_id,FK_umbracoContentVersionCultureVariation_umbracoLanguage_id,FK_umbracoContentVersionCultureVariation_umbracoUser_id,FK_umbracoDocumentCultureVariation_umbracoNode_id,FK_umbracoDocumentCultureVariation_umbracoLanguage_id,FK_umbracoContentSchedule_umbracoContent_nodeId,FK_umbracoContentSchedule_umbracoLanguage_id,PK_cmsContent,PK_cmsContentPreviewXml,PK_cmsContentVersion,PK_cmsContentXml,PK_cmsDataType,PK_cmsDataTypePreValues,PK_cmsDocument,PK_cmsMedia,PK_cmsPropertyData,PK_cmsTask,PK_cmsTaskType,PK_Redirects,PK_structure,PK_umbracoDomains,PK_umbracoMigration,PK_umbracoNode,PK_umbracoContent,PK_umbracoContentVersion,PK_umbracoMediaVersion,PK_umbracoDocument,PK_umbracoDataType,PK_umbracoDomain,PK_umbracoPropertyData,PK_cmsContentNu,PK_umbracoDocumentVersion,PK_umbracoKeyValue,PK_umbracoContentVersionCultureVariation,PK_umbracoDocumentCultureVariation,PK_umbracoContentSchedule\r\n \r\nThe following indexes were found in the database, but are not in the current schema:\r\nIX_cmsContent,IX_cmsContentVersion_ContentId,IX_cmsContentVersion_VersionId,IX_cmsDataType_nodeId,IX_cmsDocument,IX_cmsDocument_newest,IX_cmsDocument_published,IX_cmsMedia,IX_cmsPropertyData_3,IX_cmsTaskType_alias,IX_umbracoMigration,IX_umbracoNodeObjectType,IX_umbracoNodeParentId,IX_umbracoNodePath,IX_umbracoNodeTrashed,IX_umbracoNodeUniqueID,IX_umbracoNode_UniqueId,IX_umbracoNode_ParentId,IX_umbracoNode_Path,IX_umbracoNode_Trashed,IX_umbracoNode_ObjectType,IX_umbracoMediaVersion,IX_umbracoDocument_Published,IX_umbracoLanguage_fallbackLanguageId,IX_umbracoPropertyData_VersionId,IX_umbracoPropertyData_PropertyTypeId,IX_umbracoPropertyData_LanguageId,IX_umbracoPropertyData_Segment,IX_cmsTags_LanguageId,IX_umbracoUserLogin_lastValidatedUtc,IX_umbracoContentVersionCultureVariation_VersionId,IX_umbracoContentVersionCultureVariation_LanguageId,IX_umbracoDocumentCultureVariation_NodeId,IX_umbracoDocumentCultureVariation_LanguageId\r\n \r\n","SourceContext":"Umbraco.Core.Migrations.Install.DatabaseBuilder","ProcessId":31548,"ProcessName":"w3wp","ThreadId":22,"AppDomainId":2,"AppDomainAppId":"LMW3SVC21ROOT","MachineName":"IISNOZ-P03","Log4NetLevel":"INFO ","HttpRequestNumber":7,"HttpRequestId":"a2111ff9-77b8-45da-928a-6f6e1134afb5"}{"@t":"2023-02-21T15:10:10.7648844Z","@mt":"Installation step {Step} failed.","@l":"Error","@x":"System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Umbraco.Web.Install.InstallException: The database failed to upgrade. ERROR: The database configuration failed with the following message: Error parsing undefined value. Path '', line 1, position 1.