Solved - Build error -> ##[error]Solution not found using search pattern 'D:\a\1\s\**\*.sln' - build

Question

YAMAL config file:
# .NET Desktop
# Build and run tests for .NET Desktop or Windows classic desktop solutions.
# Add steps that publish symbols, save build artifacts, and more:
# https://learn.microsoft.com/azure/devops/pipelines/apps/windows/dot-net
trigger:
- master
pool:
vmImage: 'windows-latest'
variables:
solution: '**/*.sln'
buildPlatform: 'Any CPU'
buildConfiguration: 'Release'
steps:
- task: NuGetToolInstaller#1
- task: NuGetCommand#2
inputs:
restoreSolution: '$(solution)'
- task: VSBuild#1
inputs:
solution: '$(solution)'
platform: '$(buildPlatform)'
configuration: '$(buildConfiguration)'
- task: VSTest#2
inputs:
platform: '$(buildPlatform)'
configuration: '$(buildConfiguration)'
Error:
##[error]Solution not found using search pattern 'D:\a\1\s***.sln'.
RAW log:
2020-06-26T13:39:42.7115236Z ##[section]Starting: VSBuild
2020-06-26T13:39:42.7374773Z ==============================================================================
2020-06-26T13:39:42.7375115Z Task : Visual Studio build
2020-06-26T13:39:42.7375427Z Description : Build with MSBuild and set the Visual Studio version property
2020-06-26T13:39:42.7375688Z Version : 1.166.2
2020-06-26T13:39:42.7375904Z Author : Microsoft Corporation
2020-06-26T13:39:42.7376240Z Help : https://learn.microsoft.com/azure/devops/pipelines/tasks/build/visual-studio-build
2020-06-26T13:39:42.7376608Z ==============================================================================
2020-06-26T13:39:46.1317137Z ##[error]Solution not found using search pattern 'D:\a\1\s***.sln'.
2020-06-26T13:39:46.1880482Z ##[section]Finishing: VSBuild

Answer 1

Agree with Daniel, the error message Solution not found using search pattern 'D:\a\1\s***.sln' clearly states that the cause of this error is that the .sln file is not found in the s folder.
You need to check whether your .sln file is pushed to the version control. You can search this in source repo of azure devops.

Answer 2

I had the same error in my yaml pipelines,
##[error]Solution not found using search pattern 'D:\a\1\s\**\*.sln'
So I made it as my code & the yaml file are in same branch. Now it will work, I hope it will help you.