cant build android apk error: CommandInvokationFailure: Failed to sign APK package

i am trying to build a test for my app. when i build the app i get the following error

     CommandInvokationFailure: Failed to sign APK package.
     C:\Program Files (x86)\Android\android-sdk\build-tools\26.0.2\apksigner.bat sign --ks "D:/Programming/UnityProjects/MobileProject-resortTycoon/user.keystore" --ks-pass stdin  --ks-key-alias "test123" --key-pass stdin  "D:\Programming\UnityProjects\MobileProject-resortTycoon\Temp/StagingArea/Package.apk"
     
     stderr[
     Error: keywords 'java|openjdk version' not found in 'picked up java_tool_options: -df'
     Error: keywords 'java|openjdk version' not found in 'picked up java_tool_options: -df'
     Failed to load signer "signer #1"
     java.io.IOException: Invalid keystore format
         at sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:658)
         at sun.security.provider.JavaKeyStore$JKS.engineLoad(JavaKeyStore.java:56)
         at sun.security.provider.KeyStoreDelegator.engineLoad(KeyStoreDelegator.java:224)
         at sun.security.provider.JavaKeyStore$DualFormatJKS.engineLoad(JavaKeyStore.java:70)
         at java.security.KeyStore.load(KeyStore.java:1445)
         at com.android.apksigner.ApkSignerTool$SignerParams.loadKeyStoreFromFile(ApkSignerTool.java:829)
         at com.android.apksigner.ApkSignerTool$SignerParams.loadPrivateKeyAndCertsFromKeyStore(ApkSignerTool.java:719)
         at com.android.apksigner.ApkSignerTool$SignerParams.loadPrivateKeyAndCerts(ApkSignerTool.java:659)
         at com.android.apksigner.ApkSignerTool$SignerParams.access$500(ApkSignerTool.java:611)
         at com.android.apksigner.ApkSignerTool.sign(ApkSignerTool.java:266)
         at com.android.apksigner.ApkSignerTool.main(ApkSignerTool.java:89)
     Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8
     ]
     stdout[
     Keystore password for signer #1: 
     ]
     exit code: 2
     UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
     UnityEditor.Android.Command.RunWithStdin (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg, System.String[] input)
     UnityEditor.Android.PostProcessor.Tasks.TasksCommon.Exec (System.String command, System.String args, System.String workingdir, System.String errorMsg, System.String[] stdin)
     UnityEditor.Android.PostProcessor.Tasks.BuildAPK.SignPackage (UnityEditor.Android.PostProcessor.PostProcessorContext context)
     UnityEditor.Android.PostProcessor.Tasks.BuildAPK.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
     UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
     UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
     
 

i already tried reinstalling the android sdk and updating it to latest version, downloading different android versions, using the new gradle instead of internal. nothing worked. after an hour of searching for a solution i still dont know how to fix this. can someone help me? thanks alot!