Bug Failed to find entry-points bug after importing assets into 2D URP project

Hello,
I wanted to use URP in my existing 2D project but I had difficulties doing that, you can read what was wrong in this link: https://forum.unity.com/threads/why-cant-i-convert-my-existing-unity-2d-project-to-urp.1402507/
So now what I did is I exported all my assets from my existing 2D project made a unitypackage file and then created a new project (2D with URP already installed) and then imported my assets back, but I got this error message:

Code (CSharp):

1. Failed to find entry-points:
2. System.Exception: Unexpected exception while collecting types in assembly `PhotonRealtime, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null` ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'Photon3Unity3D, Version=4.1.6.17, Culture=neutral, PublicKeyToken=null'
3.   at Mono.Cecil.BaseAssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference name, Mono.Cecil.ReaderParameters parameters) [0x00105] in <ebb9e4250ed24cbfa42055e3532ef311>:0
4.   at zzzUnity.Burst.CodeGen.AssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference name) [0x00039] in <a2dd15248a25411e914af2a2c82fb63f>:0
5.   at Burst.Compiler.IL.AssemblyLoader.Resolve (Mono.Cecil.AssemblyNameReference name) [0x00079] in <a2dd15248a25411e914af2a2c82fb63f>:0
6.   at Mono.Cecil.MetadataResolver.Resolve (Mono.Cecil.TypeReference type) [0x00038] in <ebb9e4250ed24cbfa42055e3532ef311>:0
7.   at Mono.Cecil.ModuleDefinition.Resolve (Mono.Cecil.TypeReference type) [0x00006] in <ebb9e4250ed24cbfa42055e3532ef311>:0
8.   at Mono.Cecil.TypeReference.Resolve () [0x00006] in <ebb9e4250ed24cbfa42055e3532ef311>:0
9.   at Burst.Compiler.IL.Server.EntryPointMethodFinder.CollectGenericTypeInstances (Mono.Cecil.TypeReference type, System.Collections.Generic.List`1[T] types, System.Collections.Generic.HashSet`1[T] visited) [0x0002f] in <a2dd15248a25411e914af2a2c82fb63f>:0
10.   at Burst.Compiler.IL.Server.EntryPointMethodFinder.CollectGenericTypeInstances (Mono.Cecil.AssemblyDefinition assembly, System.Collections.Generic.List`1[T] types, System.Collections.Generic.HashSet`1[T] visited) [0x00057] in <a2dd15248a25411e914af2a2c82fb63f>:0
11.   at Burst.Compiler.IL.Server.EntryPointMethodFinder.FindEntryPoints (System.String[] rootAssemblyNames, Burst.Compiler.IL.Hashing.CacheRuntime.HashCacheAssemblyStore assemblyStore, Burst.Compiler.IL.AssemblyLoader assemblyLoader, Burst.Compiler.IL.NativeCompilerOptions options, Burst.Compiler.IL.Server.ProfileDelegate profileCallback, System.Boolean includeRootAssemblyReferences, System.Boolean splitTargets, Burst.Compiler.IL.Helpers.DebugLogWriter debugWriter) [0x0019d] in <a2dd15248a25411e914af2a2c82fb63f>:0
12.    --- End of inner exception stack trace ---
13.   at Burst.Compiler.IL.Server.EntryPointMethodFinder.FindEntryPoints (System.String[] rootAssemblyNames, Burst.Compiler.IL.Hashing.CacheRuntime.HashCacheAssemblyStore assemblyStore, Burst.Compiler.IL.AssemblyLoader assemblyLoader, Burst.Compiler.IL.NativeCompilerOptions options, Burst.Compiler.IL.Server.ProfileDelegate profileCallback, System.Boolean includeRootAssemblyReferences, System.Boolean splitTargets, Burst.Compiler.IL.Helpers.DebugLogWriter debugWriter) [0x001d9] in <a2dd15248a25411e914af2a2c82fb63f>:0
14.   at Burst.Compiler.IL.Server.FindMethodsJob.Execute (Burst.Compiler.IL.Server.CompilerServerJobExecutionContext context) [0x00133] in <a2dd15248a25411e914af2a2c82fb63f>:0
15.  
16. While compiling job:
17.  

While I can build and play my game normally, I get this error every time when I install a package from package manager or compile my scripts.
I do wanna mention that I am using PUN2 Photon Networking.