Hidden Expression Error in Paginated Report Builder

This is related to .Net configuration

Can be as follows resolved, see screenshot:

1. Navigate to C:\Program Files\Power BI Report Builder\RSPreviewPolicy.config

2. Create a back up of the file copying it to another location

3. Open the file with Notepad and add the following script after line </PermissionSet>

                        <PermissionSet

                                class="NamedPermissionSet"

                                version="1"

                                Name="ExecutionAndInfrastructure">

                            <IPermission

                                    class="SecurityPermission"

                                  version="1"

                                  Flags="Execution,Infrastructure"

                           />

               </PermissionSet>

4. In the section with UnionCodeGroup replace “Execution” with “ExecutionAndInfrastructure”

5. Save and reopen Power BI Report Builder

Official documentation: SecurityPermissionFlag Enum (System.Security.Permissions) | Microsoft Docs