For this pipeline:

node {
  checkout scm
  utils = load 'pipelines/utils.groovy
  stage("myStage") {
    utils.myFunction(0.5)
}
}

And the contents of utils.groovy:

def myFunction(float x) {
  // do stuff
}

I'm seeing the following error:

java.lang.NoSuchMethodError: No such DSL method 'myFunction' found among steps [archive, bat, build, catchError, checkout, deleteDir, dir, dockerFingerprintFrom, dockerFingerprintRun, echo, envVarsForTool, error, fileExists, getContext, git, githubNotify, hipchatSend, input, isUnix, jiraComment, jiraIssueSelector, jiraSearch, library, libraryResource, load, mail, milestone, node, parallel, properties, pwd, readFile, readTrusted, resolveScm, retry, script, setGitHubPullRequestStatus, sh, sleep, sshagent, stage, stash, step, svn, timeout, timestamps, tool, unarchive, unstash, validateDeclarativePipeline, waitUntil, withContext, withCredentials, withDockerContainer, withDockerRegistry, withDockerServer, withEnv, wrap, writeFile, ws] or symbols [all, allOf, always, ant, antFromApache, antOutcome, antTarget, any, anyOf, apiToken, architecture, archiveArtifacts, artifactManager, batchFile, booleanParam, branch, buildButton, buildDiscarder, caseInsensitive, caseSensitive, choice, choiceParam, clock, cloud, command, cron, crumb, defaultView, demand, disableConcurrentBuilds, docker, dockerfile, downloadSettings, downstream, dumb, envVars, environment, expression, file, fileParam, filePath, fingerprint, frameOptions, freeStyle, freeStyleJob, git, github, githubPush, hyperlink, hyperlinkToModels, installSource, jdk, jdkInstaller, jgit, jgitapache, jnlp, jobName, junit, label, lastDuration, lastFailure, lastGrantedAuthorities, lastStable, lastSuccess, legacy, legacySCM, list, local, location, logRotator, loggedInUsersCanDoAnything, masterBuild, maven, maven3Mojos, mavenErrors, mavenMojos, mavenWarnings, modernSCM, myView, node, nodeProperties, nonStoredPasswordParam, none, not, overrideIndexTriggers, paneStatus, parameters, password, pattern, pipeline-model, pipelineTriggers, plainText, plugin, pollSCM, projectNamingStrategy, proxy, queueItemAuthenticator, quietPeriod, remotingCLI, run, runParam, schedule, scmRetryCount, search, security, shell, skipDefaultCheckout, skipStagesAfterUnstable, slave, stackTrace, standard, status, string, stringParam, swapSpace, text, textParam, tmpSpace, toolLocation, unsecured, upstream, usernameColonPassword, usernamePassword, viewsTabBar, weather, zfs, zip] or globals [credentials, currentBuild, docker, env, manager, params, pipeline, scm]

This bug was particularly frustrating for me because error message did not give me any hints what the issue was. I worked around the issue by treating the float as a String. I also observed the same issue with types double and Double.