Error: 'Input is not in the .gz format' when using loadPackageFromClasspath in NpmPackageValidationSupport

[aditibj]

NOTE: Before filing a ticket, please see the following URL:
https://github.com/hapifhir/hapi-fhir/wiki/Getting-Help

Describe the issue
I am currently attempting to utilize the loadPackageFromClasspath function from the NpmPackageValidationSupport in order to perform validation using that package. However, I keep encountering an error message stating "Input is not in the .gz format."

The NPM package I am trying to load is in the .tgz format, which, based on my understanding, should be compatible. I have also attempted to load a few other NPM files that I know should work, but they yielded the same error.

Environment (please complete the following information):

• HAPI FHIR Version 4.0.1
• OS: Windows
  • Browser [e.g. chrome, safari]

Additional context
`Caused by: java.io.IOException: Error reading package: Input is not in the .gz format
at org.hl7.fhir.utilities.npm.NpmPackage.readStream(NpmPackage.java:379)
at org.hl7.fhir.utilities.npm.NpmPackage.fromPackage(NpmPackage.java:370)
at org.hl7.fhir.utilities.npm.NpmPackage.fromPackage(NpmPackage.java:361)
at org.hl7.fhir.common.hapi.validation.support.NpmPackageValidationSupport.loadPackageFromClasspath(NpmPackageValidationSupport.java:39)
at au.gov.digitalhealth.integration.b2b.out.rest.validation.CDRConfigurations.fhirValidator(CDRConfigurations.java:46)
at au.gov.digitalhealth.integration.b2b.out.rest.validation.CDRConfigurations$$EnhancerBySpringCGLIB$$a1292de4.CGLIB$fhirValidator$2()
at au.gov.digitalhealth.integration.b2b.out.rest.validation.CDRConfigurations$$EnhancerBySpringCGLIB$$a1292de4$$FastClassBySpringCGLIB$$a9ae8e08.invoke()
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331)
at au.gov.digitalhealth.integration.b2b.out.rest.validation.CDRConfigurations$$EnhancerBySpringCGLIB$$a1292de4.fhirValidator()
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
... 25 more
Caused by: java.io.IOException: Input is not in the .gz format
at org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream.init(GzipCompressorInputStream.java:193)
at org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream.(GzipCompressorInputStream.java:167)
at org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream.(GzipCompressorInputStream.java:131)
at org.hl7.fhir.utilities.npm.NpmPackage.readStream(NpmPackage.java:377)
... 39 more

Process finished with exit code 1