Could not load project file

### Description

After creating new fsharp project, I tried opening with emacs but found no Intelisense support.

### Repro steps

1. create new directory and run 'dotnet new classlib -lang f#'

2. Open Library.fs with emacs

### Expected behavior

Please provide a description of the behaviour you expect.

Emacs will open the file with Intelisense support

Please provide a description of the actual behaviour you observe.

Emacs opened the file, F# major mode loaded and no Intelisense.

### Known workarounds

Please provide a description of any known workarounds.

### Related information

* Operating system
Debian 10 x64
* Branch
master
* Emacs version
26.1
* .NET Runtime, CoreCLR or Mono Version
- dotnet
2.2.402
- Mono
Mono JIT compiler version 6.4.0.198 (tarball Tue Sep 24 01:24:35 UTC 2019)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
Interpreter: yes
LLVM: yes(610)
Suspend: hybrid
GC: sgen (concurrent by default)
* Fsharp debug output
19:59:40.024207: project "/tmp/edhoari/Beta/Beta.fsproj" verbose
19:59:40.032843: {"Kind":"error","Data":{"Code":101,"Message":"ApplicationName='dotnet', CommandLine='msbuild /tmp/edhoari/Beta/Beta.fsproj /p:SkipCompilerExecution=true /p:ProvideCommandLineArgs=true /p:CopyBuildOutputToOutputDirectory=false /p:UseCommonOutputDirectory=true /t:_Inspect_FscArgs /p:_Inspect_FscArgs_OutFile=/tmp/tmp1cea8052.tmp.FscArgs.txt /p:DesignTimeBuild=true /t:_Inspect_GetResolvedProjectReferences /p:_Inspect_GetResolvedProjectReferences_OutFile=/tmp/tmp7c0177d5.tmp.GetResolvedProjectReferences.txt /t:_Inspect_GetProperties /p:_Inspect_GetProperties_OutFile=/tmp/tmp69ba6df8.tmp.GetProperties.txt /p:CustomAfterMicrosoftCommonTargets=/tmp/tmp4137789d.tmp.proj-info.hook.targets /p:CustomAfterMicrosoftCommonCrossTargetingTargets=/tmp/tmp4137789d.tmp.proj-info.hook.targets /nologo /verbosity:quiet', CurrentDirectory='/tmp/edhoari/Beta', Native error= Cannot find the specified file","AdditionalData":{"Project":"/tmp/edhoari/Beta/Beta.fsproj"}}}
19:59:40.033603: Received ’error’ message of length 2
* Performance information, links to performance testing scripts