An error occurs because the namespace on the Unity side is not attached.
I want you to fix it on the vrchat side.
For example, change the class name
Library\PackageCache\com.unity.scriptablebuildpipeline@1.21.23\Editor\Tasks\CalculateAssetDependencyData.cs(126,30): error CS0117: ‘ExtensionMethods’ does not contain a definition for ‘ExtractCommonCacheData’
Library\PackageCache\com.unity.scriptablebuildpipeline@1.21.23\Editor\Tasks\CalculateSceneDependencyData.cs(89,30): error CS0117: ‘ExtensionMethods’ does not contain a definition for ‘ExtractCommonCacheData’
Library\PackageCache\com.unity.scriptablebuildpipeline@1.21.23\Editor\Tasks\CalculateCustomDependencyData.cs(91,30): error CS0117: ‘ExtensionMethods’ does not contain a definition for ‘ExtractCommonCacheData’
Library\PackageCache\com.unity.scriptablebuildpipeline@1.21.23\Editor\Tasks\CalculateSceneDependencyData.cs(157,82): error CS0117: ‘ExtensionMethods’ does not contain a definition for ‘FilterReferencedObjectIDs’
Library\PackageCache\com.unity.scriptablebuildpipeline@1.21.23\Editor\Tasks\CalculateSceneDependencyData.cs(198,67): error CS0117: ‘ExtensionMethods’ does not contain a definition for ‘FilterReferencedObjectIDs’