Error "Get-SPOTheme : Unknown Error"

Question

We need to modify some color codes for the built-in Red theme:-

So i tried running this command to get the JSON of the Red theme, but i got error:-

PS C:\WINDOWS\system32> Connect-SPOService -url https://***-admin.sharepoint.com   
PS C:\WINDOWS\system32> Get-SPOTheme -Name "Red" | ConvertTo-Json Get-SPOTheme  
: Unknown Error At line:1 char:1  
+ Get-SPOTheme -Name "Red" | ConvertTo-Json  
+ ~~~~~~~~~~~~~~~~~~~~~~~~  
    + CategoryInfo          : NotSpecified: (:) [Get-SPOTheme], ServerException  
    + FullyQualifiedErrorId : Microsoft.SharePoint.Client.ServerException,Microsoft.Online.SharePoint.PowerShell.GetSPOTheme  

Also when i tried to get all the themses, i got nothing:-

PS C:\WINDOWS\system32> Get-SPOTheme  
PS C:\WINDOWS\system32>   

any advice ?

Answer 1

@john john ,

Until you add a custom theme via Add-SPOTheme, there will be no output.

And we can customize default theme in SharePoint UI, however unable to get the JSON of the built-in theme.

As a workaround, use the Theme Generator tool to build a custom theme. It provides an interactive UI for selecting theme colors, and automatically generates the JSON, SASS, and PowerShell definitions for your custom theme.

More inforamtion for your reference:

https://learn.microsoft.com/en-us/sharepoint/dev/declarative-customization/site-theming/sharepoint-site-theming-json-schema

-------------------------------------Update----------------------------------------------

Use following code to define a dictionary in PowerShell for the Red theme's color palette for your reference:

$themepalette = @{  
"themePrimary" = "#d13438";       
"themeLighterAlt" = "#fdf5f5";   
"themeLighter" = "#faebeb";  
"themeLight" = "#f6d6d8";     
"themeTertiary" = "#ecaaac";  
"themeSecondary" = "#d6494d";   
"themeDarkAlt" = "#c02b30";   
"themeDark" = "#952226";    
"themeDarker" = "#751b1e";   
"neutralLighterAlt" = "#f8f8f8";     
"neutralLighter" = "#f4f4f4";      
"neutralLight" = "#eaeaea";      
"neutralQuaternaryAlt" = "#dadada";  
"neutralQuaternary" = "#d0d0d0";   
"neutralTertiaryAlt"= "#c8c8c8";   
"neutralTertiary" = "#a6a6a6";  
"neutralSecondaryAlt" = "#767676";  
"neutralSecondary" = "#666666";  
"neutralPrimary" = "#333";  
"neutralPrimaryAlt" = "#3c3c3c";  
"neutralDark" = "#212121";   
"black" = "#000000";  
"white" = "#fff";   
"primaryBackground" = "#fff";   
"primaryText" = "#333"  
}  

Add-SPOTheme -Identity "Julie Custom" -Palette $themepalette -IsInverted $false -Overwrite  
Get-SPOTheme -Name "Julie Custom" | ConvertTo-Json  

Result:

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