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4.25.4 volumetric clouds compile error on Ubuntu 18.04

Hi ,everyone
I got a syntax when comping Volumetric clouds plugin, it says as follow:
[2021.06.30-07.39.24:232][520]LogShaderCompilers: Display: Worker (3/5): shaders left to compile 17
[2021.06.30-07.39.24:232][520]LogSlate: Took 0.000046 seconds to synchronously load lazily loaded font ‘…/…/…/Engine/Content/Slate/Fonts/Roboto-BoldCondensed.ttf’ (158K)
[2021.06.30-07.39.24:294][521]LogShaderCompilers: Display: Worker (2/5): shaders left to compile 16
[2021.06.30-07.39.24:294][521]LogShaderCompilers: Display: Worker (4/5): shaders left to compile 15
[2021.06.30-07.39.24:294][521]LogShaderCompilers: Display: Worker (1/5): shaders left to compile 14
[2021.06.30-07.39.24:294][521]LogShaderCompilers: Display: Worker (3/5): shaders left to compile 13
[2021.06.30-07.39.24:296][521]LogShaderCompilers: Warning: Failed to compile Material /Engine/Transient.M_Volumetric_Sky_Prototype for platform SF_VULKAN_SM5, Default Material will be used in game.
[2021.06.30-07.39.24:296][521]LogShaderCompilers: Display: /Plugin/Volumetrics/Private/VolumetricCloudFunctions.ush(68): error: syntax error, unexpected ‘(’, expecting ‘,’ or ‘;’
[2021.06.30-07.39.24:317][521]LogShaderCompilers: Display: Worker (2/5): shaders left to compile 12
[2021.06.30-07.39.24:337][521]LogShaderCompilers: Display: Worker (4/5): shaders left to compile 11
[2021.06.30-07.39.24:337][521]LogSlate: Took 0.000066 seconds to synchronously load lazily loaded font ‘…/…/…/Engine/Content/Slate/Fonts/Roboto-Italic.ttf’ (157K)
[2021.06.30-07.39.24:350][522]MaterialEditorStats: Error: [SM5] /Plugin/Volumetrics/Private/VolumetricCloudFunctions.ush(68): error: syntax error, unexpected ‘(’, expecting ‘,’ or ‘;’
[2021.06.30-07.39.24:358][522]LogSlate: Took 0.000037 seconds to synchronously load lazily loaded font ‘…/…/…/Engine/Content/Slate/Fonts/DroidSansMono.ttf’ (77K)
[2021.06.30-07.39.24:383][526]LogShaderCompilers: Display: Worker (3/5): shaders left to compile 10
[2021.06.30-07.39.24:386][526]LogShaderCompilers: Display: Worker (1/5): shaders left to compile 9
[2021.06.30-07.39.24:388][526]LogShaderCompilers: Warning: Failed to compile Material for platform SF_VULKAN_SM5, Default Material will be used in game.
[2021.06.30-07.39.24:388][526]LogShaderCompilers: Display: /Plugin/Volumetrics**/PrivateVolumetricCloudFunctions.ush(68): error: syntax error, unexpected ‘(’, expecting ‘,’ or ‘;’*
[2021.06.30-07.39.24:776][550]LogShaderCompilers: Display: Worker (2/5): shaders left to compile 8
[2021.06.30-07.39.24:848][554]LogShaderCompilers: Display: Worker (1/5): shaders left to compile 7
[2021.06.30-07.39.24:973][555]LogShaderCompilers: Display: Worker (4/5): shaders left to compile 6
[2021.06.30-07.39.24:973][555]LogShaderCompilers: Display: Worker (3/5): shaders left to compile 5
[2021.06.30-07.39.25:142][562]LogShaderCompilers: Display: Worker (2/5): shaders left to compile 4
[2021.06.30-07.39.25:296][571]LogShaderCompilers: Display: Worker (3/5): shaders left to compile 3
[2021.06.30-07.39.25:321][571]LogShaderCompilers: Display: Worker (1/5): shaders left to compile 2
[2021.06.30-07.39.25:411][574]LogShaderCompilers: Display: Worker (4/5): shaders left to compile 1

is this a bug or something?