I was developing custom app for JIRA. At some point i decided to rename the app but for some reason i am unable to remove the app.
Steps i have tried:
I cleared plugin caches in home directory but i did not help.
I can't see these plugins in installed plugins directory as well.
Did restart JIRA.
Renamed project and upload it again.
It says : This app couldn't be loaded. It has one or more errors that prevent it from being enabled.

When i try to upload app again it throws error:
PortfolioManagement: Install Plugin
: Upload failed --- {"type":"INSTALL","pingAfter":100,"status":{"done":true,"statusCode":200,"contentType":"application/vnd.atl.plugins.task.install.err+json","sub
Code":"upm.pluginInstall.error.install.failed"},"links":{"self":"/rest/plugins/1.0/pending/3e54dc48-eb7f-43c7-b184-08827892e2c5","alternate":"/rest/plugins/1.0/tas
ks/3e54dc48-eb7f-43c7-b184-08827892e2c5"},"timestamp":1574846386627,"userKey":"JIRAUSER10000","id":"3e54dc48-eb7f-43c7-b184-08827892e2c5"} -> [Help 1]
atlassian-jira.log error:
com.atlassian.upm.spi.PluginInstallException: Unknown error, plugin not installed
com.atlassian.upm.spi.PluginInstallException: Unknown error, plugin not installed
at com.atlassian.upm.core.install.AbstractPluginInstallHandler.installArtifact(AbstractPluginInstallHandler.java:122)
at com.atlassian.upm.core.install.JarPluginInstallHandler.installPluginInternal(JarPluginInstallHandler.java:52)
at com.atlassian.upm.core.install.AbstractPluginInstallHandler.installPlugin(AbstractPluginInstallHandler.java:60)
at com.atlassian.upm.core.install.DefaultPluginInstallationService.execute(DefaultPluginInstallationService.java:129)
at com.atlassian.upm.core.install.DefaultPluginInstallationService.install(DefaultPluginInstallationService.java:97)
at com.atlassian.upm.install.UpmPluginInstallationService.install(UpmPluginInstallationService.java:117)
at com.atlassian.upm.core.rest.resources.install.InstallTask.installFromFile(InstallTask.java:156)
at com.atlassian.upm.core.rest.resources.install.InstallFromFileTask.executeTask(InstallFromFileTask.java:37)
at com.atlassian.upm.core.rest.resources.install.InstallTask.run(InstallTask.java:81)
at com.atlassian.upm.core.async.AsynchronousTaskManager.executeTask(AsynchronousTaskManager.java:124)
at com.atlassian.upm.core.async.AsynchronousTaskManager$1.call(AsynchronousTaskManager.java:102)
at com.atlassian.upm.core.async.AsynchronousTaskManager$1.call(AsynchronousTaskManager.java:99)
at com.atlassian.sal.core.executor.ThreadLocalDelegateCallable.call(ThreadLocalDelegateCallable.java:38)
at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)