Standard Buttons Missing After Upgrade from 8.0.6 to 8.1.4

Hi Community, 

We have upgraded the production environment from version 8.0.6 to 8.1.4. During the upgrade process, we encountered some errors in the log files (see below), but the upgrade continued to the latest version (8.1.4). 

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console.error('The "Default" workspace assembly is not initialized.
ConfigurationAssemblyPath [/app/conf/bin/3/Terrasoft.Configuration.dll]
WorkspacePackagesPath [/app/Terrasoft.Configuration/Pkg]
LoadWorkspaceAssemblyError: [Error has occurred during the loading of workspace build
Could not load file or assembly "CrtEmailSender, Version=8.1.4.2940, Culture=neutral, PublicKeyToken=null". The system cannot find the file specified.

Could not load file or assembly "CrtCaseService, Version=8.1.4.2940, Culture=neutral, PublicKeyToken=null". The system cannot find the file specified.

Could not load type "Terrasoft.Configuration.DayInCalendarObjectV2" from assembly "CrtCalendar, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null".
Could not load type "Terrasoft.Configuration.DayInCalendarExtendedV2" from assembly "CrtCalendar, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null".
Could not load type "Terrasoft.Configuration.WorkingTimeIntervalObjectV2" from assembly "CrtCalendar, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null".
Could not load type "Terrasoft.Configuration.CalendarUtilsBase" from assembly "CrtCalendar, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null".
Could not load file or assembly "CrtSLM, Version=8.1.4.2940, Culture=neutral, PublicKeyToken=null". The system cannot find the file specified.

Could not load file or assembly "CrtMessage, Version=8.1.4.2940, Culture=neutral, PublicKeyToken=null". The system cannot find the file specified.

Could not load file or assembly "CrtWebhookServiceBase, Version=8.1.4.2940, Culture=neutral, PublicKeyToken=null". The system cannot find the file specified.

Could not load file or assembly "CrtWebFormBase, Version=8.1.4.2940, Culture=neutral, PublicKeyToken=null". The system cannot find the file specified.

Could not load file or assembly "CrtTouchPointBase, Version=8.1.4.2940, Culture=neutral, PublicKeyToken=null". The system cannot find the file specified.]
WorkspaceAssemblies: [CrtBaseConsts (Ver. 0.0.0.0), CrtFeatureToggling (Ver. 0.0.0.0), CrtCoreBase (Ver. 8.1.4.207), CrtMLangContent (Ver. 0.0.0.0), CrtMacrosBase (Ver. 0.0.0.0), CalendarBase (Ver. 0.0.0.0), CrtEmailTemplate (Ver. 0.0.0.0), CrtML (Ver. 0.0.0.0), CrtCalendar (Ver. 0.0.0.0), CrtSecurity (Ver. 0.0.0.0), Workplace (Ver. 2.0.0.0), CrtUISwitcher (Ver. 8.1.0.6492), CrtOmnichannelApp (Ver. 1.0.0.0), IntegrationV2 (Ver. 1.0.0.2), SspWorkplace (Ver. 2.0.0.0), MLProcessDesigner (Ver. 8.0.3.1669), XSSProtection (Ver. 0.0.0.0), CSP (Ver. 8.1.3.6587), FeatureToggling (Ver. 1.0.0.0), CrtCore (Ver. 8.1.4.2810), CrtCall (Ver. 8.1.2.3000), CrtSecurity7x (Ver. 0.0.0.0), CrtTouchPoint (Ver. 1.0.0.0), CrtProductivityApp (Ver. 8.1.2.3660), CrtLead (Ver. 8.1.1.1828), CrtJunkFilter (Ver. 8.0.10.242), CrtSpecification (Ver. 8.1.4.2800), CrtMLLeadScoring (Ver. 8.1.1.1828), CrtCase7x (Ver. 8.1.3.5953), CrtProductBase (Ver. 8.1.1.1828), CrtDocument (Ver. 8.1.1.1828), CrtInvoice (Ver. 8.1.1.1828), CrtOrder (Ver. 8.1.1.1828), CrtSLM7x (Ver. 8.1.0.1455), CrtCustomer360Mobile (Ver. 8.1.0.1455), CrtSLMITILService (Ver. 8.1.2.1093), CrtOpportunity (Ver. 8.1.1.1828), CrtProductCatalogue (Ver. 8.1.1.1828), CrtCustomer360App (Ver. 8.0.10.4653), CrtSLMITILService7x (Ver. 8.1.0.1455), CrtInvoiceOrder (Ver. 8.1.1.1828), CrtSupplyPayment (Ver. 8.1.1.1828), MLSimilarCaseSearch (Ver. 8.1.0.1675), CrtContract (Ver. 8.1.1.1828), CrtMLOpportunityScoring (Ver. 8.1.1.1828), CrtContractDocument (Ver. 8.1.1.1828), CrtOrderContract (Ver. 8.1.1.1828), CrtMLLeadConversion (Ver. 8.1.1.1828), CrtProductCatalogueInInvoice (Ver. 8.1.1.1828), CrtInvoiceContract (Ver. 8.1.1.1828), CrtProductCatalogueInOrder (Ver. 8.1.1.1828), CrtSimilarLead (Ver. 1.0.0.0), CrtTouchPointInC360 (Ver. 8.1.1.1828), CrtOpportunityManagement (Ver. 8.1.1.1828), CrtOrderDocument (Ver. 8.1.1.1828), CrtOrderLead (Ver. 8.1.1.1828), CrtOrderContractMgmtApp (Ver. 8.1.1.1828), CrtKnowledgeManagementObject (Ver. 8.1.2.2782), CrtLeadOppMgmtApp (Ver. 8.1.1.1828), CrtCaseService7x (Ver. 8.1.0.2567), CrtSalesInC360 (Ver. 8.1.1.1828), CrtOpportunityInvoice (Ver. 8.1.1.1828), CrtPlaybook (Ver. 8.1.2.2782), CrtMatomoConnector (Ver. 1.0.0.0), CrtCaseManagement (Ver. 0.0.0.0), CrtOCMInLeadOppMgmt (Ver. 8.1.1.1828), CrtDigitalAdsApp (Ver. 1.0.0.0), CrtCaseManagementApp (Ver. 8.1.3.4903), CrtEngagementToolsApp (Ver. 8.1.2.3105), CrtInvoiceInC360 (Ver. 8.1.1.1828), CrtKnowledgeManagementApp (Ver. 8.1.2.2782), CrtOrderContractInC360 (Ver. 8.1.1.1828), CrtMarketingCampaignsApp (Ver. 1.0.0.0), CrtOpportunityInC360 (Ver. 8.1.1.1828), CRM_F (Ver. 8.0.7.3863), MSchooling (Ver. 8.0.7.3863), UsrApp_kgvwarg (Ver. 8.1.0.6828), UsrApp_tbza4yl (Ver. 8.1.0.6828), PfdReport (Ver. 8.0.7.3863), CrtTouchPointInLead (Ver. 8.1.1.1828), CrtLeadOppMgmtInC360 (Ver. 8.1.1.1828), CrtC360InUiV2 (Ver. 8.1.1.264), UsrApp_cs2z91q (Ver. 8.1.0.6828)]');

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This error causes the application to not display the login page. Instead, it keeps showing a blank page with the Creatio logo. When checking the console, it says:

When accessed the configuration page using the link (https://hostName/ClientApp/#/WorkspaceExplorer) we ran generate source code for all schema and compile all after, the compilation finished without errors, and the application successfully opened using the login page. However, when verifying if all functionalities were working as expected, we noticed unusual behavior: some standard buttons (e.g., Select multiple records, Select all, Export to Excel, etc.) and the VIEW button on the right are not visible, as shown in the picture below.

have you ever encountered such case ?

thanks in advance