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error: Invalid input 'Grpc.sln'. The file type was not recognized.

2017-04-12 09:18:02,971 FLAKE: tools/run_tests/helper_scripts/pre_build_csharp.sh [ret=1, pid=1038]
2017-04-12 09:18:03,147 ++ dirname tools/run_tests/helper_scripts/pre_build_csharp.sh
+ cd tools/run_tests/helper_scripts/../../../src/csharp
+ dotnet restore Grpc.sln
error: Invalid input 'Grpc.sln'. The file type was not recognized.

2017-04-12 09:18:03,147 FLAKE: tools/run_tests/helper_scripts/pre_build_csharp.sh [ret=1, pid=1067]
2017-04-12 09:18:03,322 ++ dirname tools/run_tests/helper_scripts/pre_build_csharp.sh
+ cd tools/run_tests/helper_scripts/../../../src/csharp
+ dotnet restore Grpc.sln
error: Invalid input 'Grpc.sln'. The file type was not recognized.

2017-04-12 09:18:03,322 FLAKE: tools/run_tests/helper_scripts/pre_build_csharp.sh [ret=1, pid=1084]
2017-04-12 09:18:03,497 ++ dirname tools/run_tests/helper_scripts/pre_build_csharp.sh
+ cd tools/run_tests/helper_scripts/../../../src/csharp
+ dotnet restore Grpc.sln
error: Invalid input 'Grpc.sln'. The file type was not recognized.

2017-04-12 09:18:03,497 FLAKE: tools/run_tests/helper_scripts/pre_build_csharp.sh [ret=1, pid=1100]
2017-04-12 09:18:03,674 ++ dirname tools/run_tests/helper_scripts/pre_build_csharp.sh
+ cd tools/run_tests/helper_scripts/../../../src/csharp
+ dotnet restore Grpc.sln
error: Invalid input 'Grpc.sln'. The file type was not recognized.

2017-04-12 09:18:03,674 FLAKE: tools/run_tests/helper_scripts/pre_build_csharp.sh [ret=1, pid=1116]
2017-04-12 09:18:03,847 ++ dirname tools/run_tests/helper_scripts/pre_build_csharp.sh
+ cd tools/run_tests/helper_scripts/../../../src/csharp
+ dotnet restore Grpc.sln
error: Invalid input 'Grpc.sln'. The file type was not recognized.

2017-04-12 09:18:03,847 FAILED: tools/run_tests/helper_scripts/pre_build_csharp.sh [ret=1, pid=1132]
2017-04-12 09:18:03,847 FAILED: Some tests failed
  adding: reports/ (stored 0%)
  adding: reports/index.html (deflated 22%)
+ DOCKER_EXIT_CODE=1
++ mktemp
+ TEMP_REPORTS_ZIP=/tmp/tmp.RYfbXQNLeD
+ docker cp run_tests_2bd5ac4c-1afe-4d60-9b53-fe56d1e4a564:/var/local/git/grpc/reports.zip /tmp/tmp.RYfbXQNLeD
+ unzip -o /tmp/tmp.RYfbXQNLeD -d /home/jenkins/workspace/gRPC_pull_requests_linux
Archive:  /tmp/tmp.RYfbXQNLeD
  inflating: /home/jenkins/workspace/gRPC_pull_requests_linux/reports/index.html  
+ rm -f /tmp/tmp.RYfbXQNLeD
+ docker rm -f run_tests_2bd5ac4c-1afe-4d60-9b53-fe56d1e4a564
run_tests_2bd5ac4c-1afe-4d60-9b53-fe56d1e4a564
+ exit 1
Traceback (most recent call last):
  File "tools/run_tests/run_tests.py", line 1314, in <module>
    env=env)
  File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command 'tools/run_tests/dockerize/build_docker_and_run_tests.sh' returned non-zero exit status 1